By continuing to use this site, you agree to our use of cookies. Find out more

Member postings for Pete Rimmer

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

Thread: Stuck Morse Taper in Warco Major 3024YZ
17/08/2022 06:11:09
Posted by Howard Lewis on 16/08/2022 23:40:04:

I don't think that P R was suggesting running without bthe drawbar. merely slackening, to finger tight and taking a few cuts at low speed is likely to shake things loose.

Correct I was not suggesting milling without a drawbar, just a loosened one.

16/08/2022 23:29:31
Posted by Matthew Furseman on 16/08/2022 21:37:13:
Posted by Pete Rimmer on 16/08/2022 21:28:02:

Loosen the drawbar and start cutting it'll soon come loose then

Err, is that safe?

Well I wouldn't condone running it at 2000rpm but sooner or later you're going to have a tool come loosein the taper. I guess it all depends on what you regard as 'safe'. Some people won't use a 9" grinder full stop because they don't regard them as 'safe'. I'm more than comfortable with it.

Probably best to explore other avenues TBH, my reply was very much tongue-in-cheek.

16/08/2022 21:28:02

Loosen the drawbar and start cutting it'll soon come loose then

Thread: Query copying images from Truview
16/08/2022 18:46:35
Posted by Craig Brown 2 on 16/08/2022 16:47:44:

Can you use "print screen" on your desktop to screen capture the image, copy it into Paint and then save it as a variety of image formats? You can also crop it in Paint as required. A bit long winded maybe, but should get the results you need.

On my PC hitting print screen opens up the snipping tool and you instantly get the option for rectangular, freeform, window or full screen snip.

Thread: VFD terminals , how to wire
14/08/2022 12:50:20
Posted by Michael Callaghan on 13/08/2022 17:00:40:

Hi, it’s been years since I wired a VFD, and I have forgotten the little I knew to start with. My problem is that the input side of the Delta VFD-EL is marked R/L1,S/L2,T/L3. The manual is full of drawings and safety this and that but nothing has clear has live, earth and neutral. So can anyone please let me which of these terminals are indeed live and earth and neutral. Thanks.

For single phase input L1 is live and L2 is neutral, Earth goes to the earth terminal or point on the chassis marked as such and L3 is left not connected. It may have a link plate from L2 if it does, leave that alone.

Thread: Setting up a model engineering club
10/08/2022 18:28:20

Hell would freeze over before I would take money to let some random use my machines. When people pay for something they think that it gives them free license to do as they please.

Thread: Surface grinder reassembly
07/08/2022 14:07:48

I you cared to pop down to me in Gravesend I would do a quick evaluation of your plate. You could bring the table and I'd do that too.

Thread: 5/8 8tpi ACME tap possible loan?
07/08/2022 10:20:15
Posted by William S on 17/07/2022 17:11:04:

Right bit of a long shot but if someone could help me out it would be much appreciated:

I would like to borrow a 5/8 8tpi ACME tap, I am loathed to purchase a new one as I have a feeling what I have in mind is not going to work!

I would like to use the tap as a crude gear cutting hob in order to free hob a bronze gear,

I did have it on my mind to actually make a hob and I did spend an hour in the shed realising that in order to make the hob I need to make so much other stuff that it was getting stupid! possibly all in vain if it doesn't work out! the tap will hopefully solve that problem in one foul swoop!

The aim is to create an 18tooth bronze gear that can run up and down a lathe lead screw in order to quickly traverse the carriage up and down the bed (exactly the same idea that myford used on the ml10 as a carriage traverse).

I would gladly cover postage costs if someone is able to help me out.

Many thanks and I look forward to your responses

William

 

 

William,

A 1MOD 18T gear will probably do what you are looking for. 1.8" pitch is 1.011 module. The pressure angle will be incorrect unless you're lucky enout to find a 14.5PA 1 MOD gear but that should not matter overly much just for a handweel traversing gear.

Edited By Pete Rimmer on 07/08/2022 10:21:02

Thread: Surface grinder reassembly
06/08/2022 22:12:48

Your setup there will work but it will tend to read what's under the front end of the scriber block rather than what's under the pointer. Shorten it up by pulling the rod back through the clamp a bit.

A basic repeat-o-meter is simple enough to make. I made mine from a chunk of cast iron with the corner cut off and using a stanley blade as a hinge. Took a few hours and it works very well.

repeat-o-meter

05/08/2022 12:39:29

I have several of Lamb's cast straight edges. He will supply them bare or machined ready to scrape.

The casting quality is very good and it's good iron for scraping. Not nearly as hard as the one in the pic further up which was a devil to scrape without chatter. These are ideal for the home user, if you can find a reference to scrape them from.

Thread: Hardinge HLV
05/08/2022 11:24:25

You can't put 3/4" up the hole on a ML7 but you could hold one end in a 3- or 4-jaw and run the other in a fixed steady. It would turn on it's own axis then with no need for clocking in. The two diameters would be completely concentric.

Thread: Surface grinder reassembly
05/08/2022 10:27:00

If you look at my pic at full size in the album you'll see that the centre section is quite flat so by measuring from the top flat which is only half the length of the table you'll get a pretty good result. The ends see very little bearing so there's a section at about 25% and 75% where the surface takes quite a change.

In my pic from 1 to 6 (tenths) is half a thou difference then 6 to 12 is 6 tenths difference but over 2.5 times the length. the centre is straighter than the ends.

Also account for the fact that the micrometer measurements are not affected by gravity but DTI measurements are. The table is thin so will droop depending on which way up it's held. If it's flat upturned on the plate which it seems to be, it will be negligible.

Edited By Pete Rimmer on 05/08/2022 10:27:52

03/08/2022 22:20:59

You can evaluate most small surface grinder tables just with a micrometer. So long as the mic can span from top to way you can make it as flat as the top to within a couple of tenths at least. It'll be fatter at the ends and more worn in the middle and the bottom ways will match that bow. You'll be able to see that by the wear ridges left behind.

Get a micrometer and go along the ways every couple of inches. Measure the table thickness and mark it on the way with a sharpie. Remove the wear ridges and high spots with a file if you have to. If your ends are 5 thou higher than the middle don't fanny around trying to scrape them - get a good large flat file and file a few thou off. It's a lot faster thn scraping and so long as you carefully keep track so you don't overshoot you can get within scraping distance very quickly. My eagle table had the two long ways raised higher than any other features so I just laid the file across both and it kept them planar. It's not so difficult as you might imagine.

The numbers below are tenths of a thou.

If you're near Kent I could give you some pointers or even lend a straight edge.

Edited By Pete Rimmer on 03/08/2022 22:21:59

03/08/2022 21:36:33

Yep it's slow and hard work but going too far isn't as easy as you at first think..

Half-thou deep scrapes are not normal more like 2 tenths. So if you think that you'd have trouble milling off only 1 thou of cast iron, that's a good 4-5 rounds of scraping.

What tight spots are you trying to get into? Ways inherently have open ends so I guess you must mean a dovetail? If so then just get yourself a big mechanical hacksaw blade and use it manually to cut a healthy relief in the corner.

Like most things there are a number of ways of doing this stuff. What I would advise is don't strive for perfection. So what if you dig a few double-depth holes in the work? It'll still function as intended. So what if the best flatness you can achieve is 1 thou? That's 5 times better than the 5 thou you have now.

Thread: You think you've seen it all
31/07/2022 19:14:54
Posted by Robert Atkinson 2 on 31/07/2022 11:07:12:
Posted by Hopper on 31/07/2022 02:20:39:

Traffic is not moving anywhere, what's the problem with a quick game of cricket while waiting?

In some places they would have been shooting each other after the first 10 minutes. Cricket seems much more civilised.

Edited By Hopper on 31/07/2022 02:26:23

What is wrong is that an emergency vehicle or some idot on a motorcycle may need that space or for vehicles to be moved in a hurry.
It's also against the rules.

Far better to have a bunch of guys who can step aside than a selfish driver in their vehicle blocking the route.

People are going to say that you shouldn't stop a war to play football next!

Thread: Hardinge HLV
31/07/2022 13:14:49

That IS the big problem with flat or dovetailed beds compared to vee way beds. On a dovetailed bed if you want to run the saddle right up to the tailstock end and the bed is worn you have to run the gib so loose that when it's up at the chuck end you have loads of front to back slop in the gib that holds the saddle square to the bed.

On a vee way bed it doesn't happen because gravity holds the saddle down onto the vee almost regardless of the amount of wear.

Thread: Surface grinder reassembly
31/07/2022 13:07:01
Posted by Steve355 on 31/07/2022 08:58:14:

Hi all

Tony - interesting you are doing a similar project at a similar time!

I got it running for the first time yesterday and overall was pleased with the finish result, considering I hadn’t yet dressed the wheel or even really done any adjustment other than tightening it all up. There were some very light marks on the finish that looked to me might be caused by the ratchet mechanism for the table - something worn must be causing that.

I put a clock on the table and it showed 0.0005-0.001 deviation across most of its length left to right, but headed off a cliff (!) of a few thou at the right hand end. Clearly that needs to be looked into.

Interestingly I discovered that This Old Tony’s surface grinder refurb video on YouTube is him restoring a Capco grinder. I didn’t even know they had them over there. He identifies all the areas of problem and scrapes the bed to fix it. I’ve played with scraping and have a few scrapers but never done it in anger. Let’s see how it all shapes up first. I’m sure I’ll probably be posting about it for weeks.

Steve

Don't presume that because the table moves the needle when it's moved to it's extremes of travel it's because there's wear in the table. It might be that the weight of the table being transferred from one side to the other is causing movement in the Y-axis or Z-axis ways.

Thread: Hardinge HLV
29/07/2022 20:43:45

I took the Newman motor off mine and fitted a new Siemens motor. I think tha given the age of the whole thing there's no gain to be seen from keeping the 60yr old motor over a good quality modern one regardless of how well balanced it was in the day (that Siemens motor would set you back the best part of a grand new). i ripped out all of the wiring and fitted a VFD plus some modern contactors.

One very common fault on the HLV is the compound slide base tends to go convex because of how the clamping system works. When that happens the compound won't clamp firmly and people crank down on the eccentric locking pin until the end snaps off. If you buy one no matter how good it is, that base is sure to need milling or scraping flat so just accept the fact, it's not difficult to do.

28/07/2022 22:42:17

I just sold mine, was 95% rebuilt with ground bed, scraped ways, new bearings, new motor , vfd. My friend now has it.

Headstock spindle takes a 5c collet directly in the taper. Chucks fit on the 4 degrees taper OD on the spindle although there were some screw-on versions. Tailstock is Morse 2 taper.

If you're going to look at one check inside the suds tank behind the bed. If it's got water based coolant in it then the apron probably has extensive rust damage in the gearing. Try the sliding and facing feeds to make sure they work and don't make horrible crunching noises behind the levers. Another sign of coolant damage.

If it runs smoothly and the feeds move nicely, and the coolant taks is not full of powdery corrosion or water based coolant then it should be a nice machine. For sure, a nice one will be as accurate a machine as anyone would ever want they really are (were) very well made and superbly accurate.

Edited By Pete Rimmer on 28/07/2022 22:42:43

Thread: Amazing! Too Good to be True?
20/07/2022 20:44:00

My friend loaned me a couple of those Wal Phillips fuel injectors to put on a project that never came to fruit (a landspeed racing scooter). There's nothing 'fancy' about them at all in fact compared to an average carburettor they are positively stone age. The closest thing I can liken them to is a glow engine carb.

Magazine Locator

Want the latest issue of Model Engineer or Model Engineers' Workshop? Use our magazine locator links to find your nearest stockist!

Find Model Engineer & Model Engineers' Workshop

Sign up to our Newsletter

Sign up to our newsletter and get a free digital issue.

You can unsubscribe at anytime. View our privacy policy at www.mortons.co.uk/privacy

Latest Forum Posts
Support Our Partners
cowells
Rapid RC
Eccentric Engineering
Dreweatts
Eccentric July 5 2018
Subscription Offer

Latest "For Sale" Ads
Latest "Wanted" Ads
Get In Touch!

Do you want to contact the Model Engineer and Model Engineers' Workshop team?

You can contact us by phone, mail or email about the magazines including becoming a contributor, submitting reader's letters or making queries about articles. You can also get in touch about this website, advertising or other general issues.

Click THIS LINK for full contact details.

For subscription issues please see THIS LINK.

Digital Back Issues

Social Media online

'Like' us on Facebook
Follow us on Facebook

Follow us on Twitter
 Twitter Logo

Pin us on Pinterest

 

Donate

donate