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Member postings for Graham Meek

Here is a list of all the postings Graham Meek has made in our forums. Click on a thread name to jump to the thread.

Thread: ML10 apron issue with half nuts
03/08/2020 11:31:09

You do not say if you re-assembled the Apron onto the carriage at the Tailstock end of the bed, or not.

Your leadscrew displacement might be due to the Half Nuts in the Apron not being aligned correctly on the Vertical axis of the leadscrew. This would have the effect of lifting the leadscrew, and moving it laterally. Assembling the Apron to the carriage in the middle of the Bed, or near the Headstock will allow some movement on the true centreline of the Leadscrew, especially if there is some distortion in the Leadscrew. This situation will also be not helped if you have the Myford Leadscrew Clutch fitted.

Hope this helps

Regards

Gray,

Thread: Emco FB2 Quirks and Additions
02/08/2020 16:02:52

Hi Jerry,

I think given the number of machines that have come out of the Emco works which have enhanced the Home Machinists lot quite considerably, I can forgive them one or two oversights.

We are not really in a position to know what the designers criteria was at the time. Some of the things were probably done to ease production / assembly. Plus there may have been a maximum unit price to work to.

Regards

Gray,

fig emco rotary table mods.jpg

Above is a view of the mods done to the rotary table Worm shaft to eliminate backlash, or the spring effects of the Emco standard set-up shown below, and mentioned above. Thirty years of wear can just be made out on the end face of the slotted distance piece.

The slotted Grub screw for adjusting Worm to Worm wheel engagement can be seen at the bottom of the M8 hold down slot. This needs to be removed from the tapped hole if ever the eccentric sleeve needs to be removed completely.

Also in the shot is the O-Ring in the Sector Arms used to provide the friction that the original Emco Bellvue washer was providing to make the Sector Arms stay put during Indexing moves.

fig the standard emco set-up.jpg

On the Table of the RT is a view of the other side of the slotted distance piece.

fig adjustable x-axis cursor holders.jpg

As promised earlier here is a photograph of the Adjustable X-Axis Cursor holders. The Original one was obscured by the machine vice when in use. In all fairness to Emco this is I think due to the fixed jaw of the vice being parallel to the X-Axis movement. I have noticed the fixed jaw is often shown at 90 degrees to the X-Axis on the Continent. With the vice in this position it does not obscure the cursor.

The reason for the two cursors is for visibility down each side of the vice. When one is covered the other is always exposed. When using the RT the Rt Hand cursor is removable so that the Lt Hand cursor can be transferred to the Rt Hand station. The Indexing plate of the RT fouls the cursor in the Rt Hand station and from memory It can mark the original Emco cursor set-up.

fig cursor visible down the side of the vice.jpg

More little Quirks to follow,

Regards

Gray,

Edited By Graham Meek on 02/08/2020 16:08:00

01/08/2020 11:24:46

Hi Jerry,

I understand the confusion with the Emco Rotary Table, given the Manual only describes an indexing function. As far as I was concerned the attachment was both from the start of owning Emco products. It would have been better if Emco had chosen a 60:1 ratio as regards using the attachment as a Rotary Table. The 40:1 ratio is a bit fast for circular milling but you get used to it, although somewhere in my drawing files I have a 60:1 worm and wheel conversion drawn up.

I used the attachment as both Dividing Head and Rotary Table until I had a chance to design my own Dividing Head.

fig 5.jpg

This is a marriage of GHT's Versatile Head, the Emco Rotary Table, the Emco machine Vice swivel base and a bit of Meekising.

As regards the end float on the Worm Shaft. In the normal Emco design all float is taken up by a special Bellvue Washer with a cut-out in it to clear the locking screw of the sector arms on the indexing plates. This serves two functions in that it provides friction to make sure the sector arms stay put, but also to take up the play in the worm shaft bearing. This is fine for indexing, but when it comes to circular milling it has an Achilles Heel. Provided the cutter rotation and rotary motion of the table are in sink, everything is fine. If however the rotary motion is using the Bellvue washer as its resistance to the cutting forces things can get a little hairy with a tendency for the cutter to snatch.

To this end I have done away with the Bellvue washer arrangement and fitted a special spacer to take up the backlash. I use the same arrangement on my Dividing head, and feel I had better take some photographs of that. One photograph saves a thousand words, the special spacer can just be made out in the last photograph of my last post.

As regards the depthing of the worm in the worm wheel. In the M8 Tee Bolt slot for holding the Rotary Table down to the cross-slide or milling table there is a Slotted Grub Screw that acts as a stop. This is screwed in or out to get the desired adjustment, but you will need just a little play.

Hope this helps,

Regards

Gray,

 

Edited By Graham Meek on 01/08/2020 11:29:12

31/07/2020 15:17:05

An item I have had on trial for a while is a set of Adjustable Stops for the Emco Rotary Table. These are in-valuable when two radii have to meet, or intersect. As the Stop takes away any chance of an over-run with the table, or turning the handle in the wrong direction.

fig emco rotary table stops.jpg

I was using this today on the Main Support for the Lathe Tool Honing machine I am building and described on a separate post.

finished radius and intersection.jpg

Also in use is something I made over 30 years ago, and shown above the graduations in the next photograph. It is a simple stepped and slotted Hold-out Washer.

hold-out washer.jpg

This sits beneath the indexing pin handle on the Rotary Table, there-by keeping the pin out of engagement with the Dividing Plate. This is a real boon when circular milling. It takes minutes to make but saves hours of frustration.

hold-out washer in-situ.jpg

Also in the shot is my revised X-Axis Stop and move-able cursor holder. More on that another time.

Regards

Gray,

Edited By Graham Meek on 31/07/2020 15:18:48

31/07/2020 10:57:20

Hi Hans,

The modified Emco plug in my drawing above, started out in exactly the same way as you describe, before I added the spring loaded valve. The problem with the Emco plug is two fold. The end of the plug is flush with the inside of the gearbox cover. Oil accumulates on this surface during use. When the quill is lowered and then raised droplets of oil from the end of the plug are carried into the foam.

The second problem is with continued usage this oil builds up in the foam and starts to leak over the outer surface of the cover. This returns the Status Quo, and there is another oil leakage. Even using the spring loaded version of the Emco plug, this allowed the oil to accumulate in the hex socket. Every so often when using the quill I used to get this spray over my safety glasses, the small hole makes an ideal spray nozzle arrangement. This usually occurred immediately after I had just cleaned the safety glasses.

This is why in the final design there is an 8 mm counterbore in the end of the new plug to stop the initial oil accumulation. As with all designs, the Devil is in the detail.

Regards

Gray,

28/07/2020 10:33:54

Thanks Mark for adding your latest FB2 enhancement, also for giving me a reminder. I must get on and gather up some more items for you and this post.

Regards

Gray,

Thread: Capillary gaps required for silver soldering.
26/07/2020 11:43:59

I use a spring loaded centre punch to get consistent punch dot sizes and thus a consistent gap around the joint.

Regards

Gray,

Thread: Emco FB2 Quirks and Additions
24/07/2020 16:47:48

Hi Joe,

Thanks for the kind words, I am taken by your impressive line up. I particularly like the CNC conversion this looks to have been well thought out.

There are times when I wished I had retained my last Green FB2. The current machine with the control panel to the front of the machine means the operator is stood further away from the machine. This is not good for my posture and I am also constantly leaning on the E-Stop button, so far it has always happened when the machine is no running.

This would be my only criticism of my current machine.

Regards

Gray,

24/07/2020 15:22:33
Posted by Jim C on 23/07/2020 20:05:09:

Hi Graham.

I own a Rishton mill which is very similar to your FB2 but with some minor differences.

The speed change levers live on the left of the head and like you I have an issue with a small oil leak from the spindle.

I do recall some time ago seeing your snifter valve being detailed in I think, MEW magazine but don’t have access to the drawings. Do you have them available or can you direct me to them.?

Some of my 2MT tooling is difficult to remove from the spindle (may be me over tightening it?.) so I use a couple of wedges and a homemade clamp to squeeze them together. The removal mechanism at the top of the drawbar does not work for me !! does yours have such a feature.

Looking forward to seeing more of the additions you have designed and hoping I can adapt them to the Rishton.

Regards, Jim.

Hi Jim,

Please find below the drawing of the Breather/Snifter Valve. I am not familiar with the Rishton as regards the filler plug thread details so you may need to check this. The 8 mm counterbore is there to stop oil that makes on the face of the standard plug making its way out of the machine. Something I learnt with the modified Std Emco plug.

To size the thread I used a micrometer over 3 drill shanks on the original plug and made my new plug to that dimension. 

emco fb2 snifter valve.jpg

As regards the tooling getting stuck. It may be better if I detail what I do and how the FB2 is configured.

The Top of the Spindle is threaded M18x1. Onto this is threaded a Cap Nut, which accepts the head of the M10 Capscrew drawbar. This cap nut is locked onto the spindle using a 17 A/F spanner, this does not need to be excessively tight. I have introduce a washer above the the head of the Capscrew to limit how far I have to turn the Allen Key to undo the drawbar, before it contacts the cap nut. Plus this washer introduces another face for the capscrew to slide over, rather than directly on the cap nut itself. An EP grease is good at this point.

I keep on the shelf behind the mill a clean lint free wipe, every tool change the new piece of tooling gets a wipe. The Morse Socket gets a clean about every 6 months with Isopropyl and another wipe.

The dry surfaces of the Morse taper should be enough to hold that item of tooling during use. The drawbar is there merely to stop the tooling coming out during use from cutting forces, Helix on an endmill or slot drill, etc. I have a long series 8 mm A/F Allen Key and this is used to tighten the drawbar, but the pressure on the Allen Key is the Second Finger of my Rt Hand, nothing more.

A quarter of a turn with the Allen Key is all that is required to undo and remove the tooling. Occasionally my Shell Mill holder will turn slightly under heavy cutting and tighten itself up further, but the long series Allen Key undoes the cutter with a sharp crack.

I hope this helps,

Regards

Gray.

 

Hi Derek,

You are not alone with regards to not thinking it is due to positive internal pressure. Some have gone to extremes to disprove what the rubber glove finger has proved. The bottom line is I have no oil leaks and my machine is 24 years old this year.

Quite a few of the things I have done for the FB2 are shown in my Album, I really ought to get a list together, so you may need to bear with me on that.

Regards

Gray,

 

 

Edited By Graham Meek on 24/07/2020 15:27:29

23/07/2020 16:52:27

The only Achilles heel with the FB2 from what I have read about is the Tufnol Gear (Gear 47 in the parts List), which some people have had some teeth stripped off.

fb2 tufnol input gear .jpg

I have seen these gears up for auction with the asking price double what a new spare part costs. As many of the parts are no longer being made by the factory. It is just a matter of time before these too will no longer be available. The last time I took the gearbox apart I took the measurements of the gear and have made a drawing.

It is interesting to note that the gear is a DP, and not a Module form. Having originated in Austria I did assume the latter, until the sums just did not add up for a 45 Tooth Helical gear.

One of the reasons I think these gears fail is due to owners using the lowest gear to lock the spindle to remove any Morse tooling. If one tries to turn the spindle backwards by hand in the lower range there is a feeling that something is binding, just prior to the gearbox locking up. I think it is the Tufnol gear crowding the smaller steel motor pinion.

Removing a stubborn Morse taper using this method is going to put things under stress at one point on the Tufnol gear. Unlike when the machine is running and several of the teeth are sharing the load.

To make the changing of tooling much easier and to remove any risk of premature breakage. I designed and fitted the spindle lock below. This makes locking the spindle dead easy and with no risk of damage to any part of the gearbox.

fig1 positon of ball handle when un-locked.jpg

fig2  ball handle shown in locked position.jpg

Over the coming months I hope to try cutting a new 45T gear by simply gashing at 8 degrees. It will not be a true helix but given the gear is 12 mm wide and the Lead is well over a metre, I don't think it will matter. It is certainly worth a try and if it works I shall have a spare to hand.

Regards

Gray,

04/07/2020 10:54:00

Hi Nigel,

Over the years of owning and working with the FB2 I have tried to make things which have added to its versatility and ease of use.

The green machine above was one of a pair of machines. One machine was modified in that the head was permanently on its side and the column was off-set to the right. A thick ground steel plate approx 50 mm thick was used to off-set the column. This brought the spindle back on the centre-line of the cross-slide, thus allowing more use of the table with this type of set-up. Plus the thickness of the plate allowed for tooling in the spindle with no loss of cross slide travel

This machine was used mainly for edging plates and as a Horizontal Borer. This allowed me to machine plates and parts which could not be normally accommodated within the "throat" of the mill.

Just remember to tighten the filler plug if you tilt the milling head to the right. I just tighten the grubscrew to put more pressure on the ball valve. This stops all but the slightest dribble of oil.

Regards

Gray,

03/07/2020 10:06:23

I have recently received many emails from around the world for more details on the various attachments and advice on owning an Emco FB2. While a lot of my attachments have appeared in print, there are some who have never read these articles.

Thus I thought it would be a good idea to get a catalogue of some of the quirks, problems and attachments listed somewhere.

One thing that needs to be sorted is the confusion about the FB2, Several adverts seen over the years list the 4 Speed "Mentor Mill" with its grease filled milling head as an FB2, which incidentally has a 6 speed Oil filled milling head and replaced the Mentor Mill. The number of speeds is the dead give away, as is the integral motor of the Mentor Mill, which in my experience were always Hammerite Blue, or Green.

One recurring quirk or problem with the FB2 is that of Oil leakage from the Milling head. Many who have purchased a used machine automatically think it is due to a failed Oil Seal or O-ring. Of the latter there are 5 on the FB2, one large one on the Quill and two each on the shafts of the Speed change levers.

Two running seals made by INA are fitted, one to the top cover and one is recessed within the Quill assembly.

In the 34 years I have owned these machines I have yet to have any of these seals fail, despite near constant usage.

By far the biggest culprit for oil leakage is pressurisation of the gearbox. I first noticed this when one morning after receiving the above mill. A small pool of oil appeared over night on the milling table. As the machine was only a few days old it could not be a failed seal.

Leaving the filler plug slightly open cured this leak. Leaving this plug open to the atmosphere allowed the pressure inside to escape. Not being happy with the open filler I modified the standard Emco plug, then designed and fitted the plug shown below, which is basically a snifter valve.

fig 1 breather valve installed.jpg

fig 2 component parts of the valve with a standard & modified emco plug to the rear..jpg

Since fitting this valve I have not suffered any further oil leaks on either of my machines. There are however some who doubt that the head does pressurise. To this end I recently carried out a simple experiment using the finger from a Nitrile glove. This is slipped over a modified sealing washer.

fig 1 cold machine.jpg

The next photograph was taken 1 minute later after running light at 2000 RPM

fig 2 after 1 minute at 2000 rpm.jpg

Leaving the "indicator" in-situ while carrying on working saw the finger disappear to the far corner of the workshop. Those who have not successfully tied up a Party Balloon will know the score here.

I intend to add to this post from time to time.

Regards

Gray,

Thread: Meek Type Dog-Clutch for Denford
27/06/2020 11:08:22

Nice work Will,

This machine will benefit from the attachment and you will wonder how you ever managed without it before.

Regards

Gray,

Thread: ML10 - racking of carriage?
25/06/2020 16:05:07

Glad my advice worked out, with errors like that I would leave well enough alone and modify my method of working.

A Clock (DTI) is truly a wonderful thing, as are feeler gauges which are very often over looked. A clock in skilful hands can save a lot of worry when it comes to machine tools and wear.

One thing I would do is make some felt wipers with metal protectors for that bed. These will slow down any future wear and keep the bedway lubricated for longer.

Regards

Gray,

24/06/2020 19:10:37

You have to remember that you are exaggerating the error by having the clock extended.

There is a back up plan, and the lathe can always be salvaged. Odd items for ML 10's always appear for sale.

Regards

Gray,

24/06/2020 16:44:41
Posted by Ignatz on 24/06/2020 15:48:13:

Graham, interesting point about the rear dovetail on the carriage. Is there any way to check that without disassembling and applying bluing?

You could start with a feeler gauge either side of the saddle, but do not move the carriage during the test as you may be rocking the saddle and get a false reading. If you cannot get a 0.0015" or 0.04 mm feeler gauge into any gap this can only be good news.

If the blade does enter, check if it goes in by the same amount each side. This will tell you if the wear is equal. I would expect the greatest wear on the right-hand side, but you might be lucky and have it symmetrical.

You can go to town with micrometer blue if you feel confident. Provided you have found wear then I would scrape the central portion before I put on any blue. Ideally setting the Saddle up vertically such that a short ground roller resting in the dovetail, can be used in conjunction with a clock to check where to scrape.

If the back face of the saddle is machined you could get away with a micrometer and a roller, after removing any paint.

Getting right into the corner can be difficult if the scraper is not thin enough. A lot depends on how big the flat is on the corner of the bedway dovetail.

Regards

Gray.

24/06/2020 15:35:04

From what you say I would say the rear Dovetail of the Saddle that bears against the rear of the bed is worn such that the dovetail is higher in the middle of the slideway than on the two ends. This lathe comes with no felt wipers on the saddle to bed interface and with the ingress of debris the inevitable wear is a problem.

To rectify the error the dovetail needs to be scraped in the central portion to remove the high spot. Preferably taken a little below. This will retain oil and allow the ends to wear down to the new surface.

However if you are not experienced in scraping dovetails I would leave well enough alone and adopt a different style of working as John suggests above.

Regards

Gray,

Thread: Weeds in a 'lawn'
21/06/2020 11:29:42

I have found cutting the lawn too short encourages weeds. Scarifying the lawn for a moss infestation is a good start. The lawn will also benefit from forking every 100 mm, 4" to get some air into the soil and improve drainage. Lawn sand brushed onto a lawn after forking will help with the drainage. Moss loves a water logged lawn.

I have found a Weed and Feed by Vitax, (usual disclaimer), to be very effective at controlling what weeds I get and improving the colour. I do think though that you will need to do some reseeding before you can apply this.

Vitax cannot be applied on a new lawn, and that goes for many of the other preparations. I have used in the past a product by Westfield this is a weed and feed, but it has grass seed included. This product is very environmentally, pet and children friendly.

Regards

Gray,

Thread: HSS/Tungsten Tool Honing Machine
18/06/2020 09:26:03

table carrier sub assy.jpg

Thanks Michael, but I do not always get things right, no one ever gets to see my scrap box.

The break through, if I can call it that, came when I thought about having separate dedicated tables for each function. The radius attachment needs a setting fixture and this too took some simplifying, the last thing I wanted was a very complex tool. To set a radius accurately merely requires the use of the appropriate sized feeler blade, but more on that again.

Regards

Gray,

Edited By Graham Meek on 18/06/2020 09:26:50

Edited By Graham Meek on 18/06/2020 09:28:22

17/06/2020 12:10:13

honing machine rev d.jpg

I have just started the manufacture of a Project which has been 8 years in the design stage. Certain features which I wanted to include in the machine were proving difficult to fit into the space available, but I think I have done it now, thanks to help from John Slater.

There have been many times I have needed to put a very fine radius on a tool, and while I have managed to do this free hand it would have been so much easier with a dedicated piece of tooling. Which presented the tool to the Hone in a repeatable manner. The recent post on Boring Bars brought out a piece of information from the Sandvik web site concerning the tip radius on a boring tool, with regards to the depth of cut taken. Sandvik recommend that this radius should never be larger than the depth of cut. This has spurred me into getting this machine up and running if only to prove the above works in practice.

I hope over the coming months to keep you informed of my progress.

Regards

Gray,

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