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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: MT end mills slightly corroded
10/05/2021 14:17:17

Hi, however this type with a left hand spiral and a right hand cut, should in theory, tend to push the cutter into the taper.

1 M/T Tanged Counterborers

Regards Nick.

Hi Nick,

That might be true, re cutting forces, but in my experience these type of cutters are more likely to be "end cutting reamers". Many of the chucking reamers I have are LH spiral.

They may well work as an endmill, but if they were mine I would cut the Tang off and tap for a drawbar. The other problem with these cutters is not all of them are HSS, I have been given some which were Carbon Steel.

Regards

Gray,

10/05/2021 08:03:11

Morse Taper cutters that resemble an endmill, but have a Tang, and not a Tapped hole, are usually used to produce counterbores. The thrust from the cutter during counter-boring tending to push the cutter into the Morse socket, rather than winding it out during milling.

Without the tapped hole it would be foolish to use these for milling unless one wants to lead an exciting life, with a possible visit to A&E thrown in for good measure.

Regards

Gray,

Thread: Press fit sizing
25/04/2021 12:59:20

In the UK we generally work on the Hole Based System of tolerances. Capital H being the designation, these holes are always plus on the Nominal Dimension. All limits and fits are therefore applied to the Shaft or Bush being inserted and are lower case letters.

The Zeus handbook gives all the relevant details of the most commonly, or Preferred Limits used.

The Oilite bush will therefore come above the nominal size, to fit a standard H7 Hole. That hole being, as a Very Rough rule of Thumb, plus 0.025 mm or 0.001", a Smaller hole is less than, while a Larger hole more than.

A certain amount of deformation of the Oilite bush occurs during insertion and the bore of the bush should be a Standard H7 hole after insertion.

On the Continent they prefer to work to the Shaft Based System, the shaft designation carrying the Upper case letter, and all holes, Lower case, these holes are machined accordingly.

Hope these notes help,

Regards

Gray,

 

Edited By Graham Meek on 25/04/2021 13:00:36

Thread: Emco FB2 Quirks and Additions
17/04/2021 10:58:09

A while back I was contacting various friends to see if they had the number of the ball bearings used in the FB2 main drive Motor. The reason being I would rather have new bearings to hand prior to dismantling, than have to wait for new ones to arrive. Joe in SA even offered to take one of his machines apart to find out, but I could not put him to all that trouble.

Eventually through prolonged enquiries with the manufacturers of the motor, ATB, I have found out the number of the bearings they use, which is 6201 2RU.

There are other motors used, but to date I have not been able to find these bearing numbers.

When I dismantled the motor I found that the bearings were just about at the end of their life. The grease had all worked out of the bearing through the non-contact seal. I am not surprised at this, as the temperature in my workshop has been in the low 30C in the past couple of years. With the FB2 motor sitting just below the insulated roof, but next to the skylight.

I hope these notes will help anyone else contemplating a motor strip down.

Regards

Gray,

Edited By Graham Meek on 17/04/2021 11:00:15

Thread: Boxford STS Screwcutting Clutch
07/04/2021 17:02:33

Hello Brett,

That would be good, as long as it is not putting you to any trouble.

Regards

Gray,

PS Sent you a PM.

06/04/2021 17:02:09

Hello Brett,

First of all my apologies for getting your surname wrong. Memory recall for me these days is a problem.

It might come a surprise to you that I have long admired your work, especially the adaptations you have made to your lathe. George Thomas would be proud of you. Thanks also for the additional photographs.

Your design of screw cutting clutch I feel will also fit the Emco Compact 8, and would be far less work than my design, which to date has not been proven.

I also feel Don would benefit from your design, did you make any drawings?

Regards

Gray,

06/04/2021 11:47:04

Hi Don,

I have sent you a PM,

Regards

Gray,

05/04/2021 11:52:23

Hi Don,

The Tumbler Reverse Lever is redundant with a screw cutting clutch fitted.

A lot of these machines have their heritage in the Emco Compact 8. This was adapted in the Far East to become the 918, which I am sure your lathe derivative is based on. I am also sure the photograph I saw of a screw cutting clutch fitted to a 918 will fit your lathe.

I think the guys name is Brett Merkle? (I may have the spelling wrong, for which I apologise).

He recently wrote an article in Model Engineers Workshop where he fitted a clutch to the main drive of this lathe. He is the man you really need to contact. Perhaps The Editor, Neil Wyatt would forward your email to him?

I am sorry I cannot help any further than this.

Regards

Gray,

04/04/2021 12:48:20
Posted by Don Pittman on 04/04/2021 04:37:35:

I'm trying to understand how to adapt the Meek design to my Asian made 10x22 lathe. I've read many different adaptations but just seem to confuse myself more.

Very very similar lathes to mine have had the clutch fitted to them successfully but my lathe has some differences and I'm not sure how to calculate the changes needed. The similar lathes that I have read about having the clutch adapted to them are the Grizzly and Warco lathes. My lathe is a Canadian "Craftex" 10x22 lathe with a bit different gear train in it.

I'm hoping someone might be able to help me with what I need to figure out.

I appreciate all the information and sharing you fine folks have done.

Don

Hi Don,

Some while back Jim Schroeder did a version for the Grizzly lathe which looks very much like your machine. There are a couple of Jim's videos out there and he also did a write up on his conversion in Home Shop Machinist. I think the articles appeared at the very end of 2014 or the beginning od 2015.

There is another version which was for the older 918 lathe, but I am not familiar with this attachment as I have only seen one photograph of this. This is by a fellow MEW's author, who's name escapes me at the moment. I am pretty sure he lives in New Zealand and is an electrician, but that is all my grey matter will allow.

Regards

Gray,

Thread: Lotus 7 and Mini 2 cylinder
21/03/2021 11:26:54

During the early 1980's whilst working for a Toolmaking firm in Gloucester. We did some prototype tooling for a 3 cylinder A series engine being developed by Austin-Rover as I think they were called at the time.

Basically it was an A series block with one less cylinder. I always wondered what happened to this development programme as they were among only a few companies looking into this type of engine at the time.

Regards

Gray,

Thread: Boxford STS Screwcutting Clutch
17/03/2021 17:19:43

Hi Trevor,

I had a feeling that this type of arrangement would give you a better result as regards repeatability. The other advantage is you can set your trip distance to a convenient dimension purely by juggling the lever lengths.

Thanks for trying out my suggestion.

Regards

Gray,

10/03/2021 10:32:09

Above the two smaller cast iron gears and the Tufnol intermediary gear take the drive from the clutch output shaft to the new Banjo drive gear position.

As stated before the new Banjo drive gear position is on a common radius with the original Emco output shaft, taken from the screwcutting gearbox input shaft.

The photograph below shows the original shaft with the wide gear on and the new shaft at about 7.00 o'clock.

clutch fitted.jpg

All the operating mechanism is hidden from view and goes under the headstock to the lever at the front.

Regards

Gray,

09/03/2021 17:41:49

maximat screwcutting clutch mk 2-cross section.jpg

This is the cross section through the Maximat Clutch, note the one Dog gear takes its drive directly from the wider output gear from the headstock' This gear also meshes with the idler gear shown below to reverse the direction to the other Dog gear. (Shown in mesh).

the parts that makes up the screwcutting clutch for the maximat.jpg

The above are the elements necessary to make the dog clutch work on the Maximat.

the dog clutch proper.jpg

Above are the two Dog gears, the Double sided Dog clutch and the output gear on the Clutch shaft. Only the Dog clutch is keyed to the Clutch shaft. Drive to the output gear is only achieved by selecting a direction with the control lever.

clutch control lever.jpg

This connects to the stop rod which carries the stops.

trip rod attachment and stop.jpg

support for trip rod, tailstock end.jpg

These then are the elements required for a successful clutch.

Regards

Gray,

09/03/2021 10:24:13

Hi Tony,

This may, or may not be possible, but the idea has just come to me. As regards the Banjo, provided there is sufficient depth within the cover, the Banjo could remain at its current position, but be outboard of the screwcutting clutch.

The gear clusters on the Banjo being mounted on the inside of the Banjo rather than the outside as they currently are. A Steel plate Banjo would not need to be as thick as a Cast Iron one.

I know this might be a bit fiddly when setting up a gear train, but the need to change the set-up is fairly infrequent in my experience.

Regards

Gray,

08/03/2021 11:25:31

Hi Tony,

Your solution will work fine and is exactly how Trevor and I worked out the STS set-up. The automatic trip mechanism for the stops can be a bit more tricky to fit, but the permutations here are endless. While the trips to the rear of the bedway are usually more compact as regards any lever lengths. Having them at the front abutting the apron will make it more convenient.

Having the internal feed direction change within the headstock is fine for doing left hand threads, or when the banjo set-up has an additional stud in the train from what it normally does. Once set, this internal gearing cannot be altered, as this will up-set your synchronisation point in the dog-clutch, by a factor of how many teeth are involved in the internal reversing gear.

Regards

Gray,

06/03/2021 11:55:16

Hi Clive,

I am not familiar with this lathe, but from what I can make out from the scan. The P&W clutch drives in one direction only. If this is correct then the leadscrew clasp nuts need to be disengaged to return the carriage to the start position.

The Hardinge HLV clutch, which the original Myford, and all my subsequent designs are based on, drive in both directions. There is no need with these designs to disengage the leadscrew clasp nuts.

This makes cutting any Thread, DP or Module dead simple. With no reversal of the motor needed either.

Regards

Gray,

Hi Tony,

As I said earlier, this is not going to be easy, and somewhere compromises have to be made. If you look back up this post to the clutch fitted to my Maximat. You will see the clutch proper is in front of the original output shaft from the headstock and below it. The final output from this clutch goes via 3 gears to the output shaft. which is on the same radius from the screwcutting box as the original output shaft was.

Turn this type of assembly through 90 degrees CW and you will have a similar unit to fit your lathe. More detailed shots of the Maximat unit can be found in My Album.

Regards

Gray,

 

Edited By Graham Meek on 06/03/2021 11:56:04

05/03/2021 11:35:41

Hi Tony,

Harrison have surely made this one difficult with the banjo pivoting about the output gear. Relocating the banjo to the more conventional position about the input to the screwcutting box might need a whole new banjo design.

My inclination suggests taking the drive from the output shaft, 1:1, to a gearbox containing the clutch directly above the output shaft, there is plenty of room here, but part of this space will be taken up by the banjo movement.

The drive is then brought back to this output shaft either by gearing or by a timing belt, 1:1.

Failing that the obvious place to fit the clutch is inside the headstock, but that will be major work and not for the faint hearted.

Regards

Gray,

04/03/2021 11:53:58

Hi Tony,

Clive's statement does generally hold true, but there is, "the exception that proves the rule". I know in one instance, and it may well be the STS above. There was an internal reduction with-in the headstock of 3:1. In other words the output shaft where the clutch is fitted is running at 1/3 spindle speed.

Conversations at the time were stating that the clutch would not work. At first glance this would seem to be the case, however the single dog will only engage at one point in this reduction train each time, because the gears inside the headstock have remained in mesh throughout.

Please keep us informed of your progress and if you get stuck we are only an email away. (A photograph of the space available might not go amiss).

Regards

Gray,

Thread: 2-Part Covid Vaccinations
03/03/2021 11:03:31

I have always expected the "First Dose Rate" to taper off. There are bound to be many people who have had their first dose, but are now requiring their second dose. The facilities for administering the doses have not been expanded so the current facilities must be catering for both, hence the reduction in "First Doses".

Regards

Gray,

Thread: Emco FB2 quill
26/02/2021 17:48:10

Hi Sam,

I have sent you a PM, it is something you might want?

finished 8mm longer emco fb2 quill assembly.jpg

bought in items for revised fb2 quill.jpg

new parts for redesigned fb2 quill.jpg

Regards

Gray,

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