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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: Chuck fitment to dividing head
18/01/2021 23:25:51

You could remove the spindle from the dividing head and single-point the thread, so long as it's not hardened.

18/01/2021 18:40:19

Offer the dividing head spindle thread up to the South bend spindle thread. If the pitch is the same then the threadform must be different. Get a 1.5" - 8 TPI UNS die and run it down the thread on the dividing head, then your chucks will fit, and so will any Whitworth ones.

Thread: Myford ML7 4 way tool holder
17/01/2021 17:38:50

Beware if you skim too much off the base the tool support can bend down when you clamp the tools. I once had a toolpost where this had occurred.

Thread: Spur gear help.
15/01/2021 18:15:32

Those are 10DP gears, but you don't have to use 10DP, you could use 20DP (myford) gears and double the tooth count, or any other DP that will achieve the 2.40" centre distance.

Thread: Hardinge HLV-H
15/01/2021 14:53:32
Posted by stuart froud on 15/01/2021 14:24:03:

We have 2 Hardinge Super Precision manual lathes:

S/N KL1-2124

S/N HLV-H249

With the follow issues:

  • Feed not working
  • Screw cutting feed selection knob broken
  • Top slide locking cam shaft broken
  • General service required

Looking to find someone 'handy' as recently understand from Hardinge in Europe that they do not have any one in the UK, plus parts/spares a bit limited.

Ideally the sooner the better

Many thanks.

The top slide locking cam breaks because the top slide base is prone to becoming bowed which causes unwanted rotation of the slide under load so it requires more and more clamping until the cam bolt shears. Ask your operator if this has been the case? This will require scraping of the top slide, and a new cam bolt made, as I have done on mine.

Feed not working I take it is the electrical feed to the carriage from the tailstock control? That would need diagnosing as would the feed selection knob (i.e. is it just the knob or the selector behind). Neither should pose too much of a problem to a competent person.

Thread: Worm wanted for lathe
10/01/2021 22:49:17

The hole with the spring in it. The pin should be a good fit in there.

10/01/2021 17:29:55

Looks like the hole in the lever is much larger than the pin. I would be turning a bush to make it a good sliding fit. Or make a new pin to fit the hole.

Thread: Clarke CL250M Metric Screw Cutting Gears
10/01/2021 11:56:17

The way I'm reading it, is that Ian finds that he is unable to mesh the 48 of Z2 with the 24 of Z1 without the 40 and 42 fouling each other.

I'm not familiar with the machine but the obvious solution would be to flip Z2 over so that the 40 is on the outside. It would probably require a spacer behind the carrier, and Z3 would also require a spacer so it lines up with the 40T of Z2.

Edited By Pete Rimmer on 10/01/2021 11:56:34

Thread: Worm wanted for lathe
08/01/2021 22:00:06

The M300 at your work will cut that worm if you set it to 23TPI (C5SY) and swap the 88 and 44 gears around.

08/01/2021 21:14:57

It says 18DP right there on the drawing and the mating wheel is drawn as18DP 33T. The 5.75TPI and .174 lead are a little at odds with each other (0.17391 vs , 0.17450) I guess that they calculated half a thou per pitch is close enough.

Certainly, the engagement mechanism seems to be hit-and-miss enough to allow for a much wider error.

Thread: Hardinge HLV-H
08/01/2021 19:35:03

What sort of work needs doing to the machines Stuart, and over what time frame?

Edited By Pete Rimmer on 08/01/2021 19:35:11

Thread: Worm wanted for lathe
08/01/2021 19:32:21

Well, given that the kind gentleman has pointed you to the correct drawing on the Denford forum:

You now have all the info to produce your worm. Bonus if you can find a lathe which has 5 3/4TPI on the gearbox.

CVA has that pitch on the gearbox as does my Monarch.

07/01/2021 23:54:02

Yes it does look as if it's only achieving half engagement. I wonder if the stops on the rotary lever can be adjusted? Might interfere with the operation of the threading interlock, if it has one, or knowing Denford they might have used the interlock AS the stop.

07/01/2021 23:27:30

Looks like both original parts are cast iron. I see no reason why you couldn't make them from mild steel though.

For a permanent fix you could do a number of things:

Make a new worm and a new wheel to the original sizes.

Make a slightly larger worm and re-cut the wheel with a 1-off form cutter. Depending on the condition of the wheel it might only need cutting 10 or 20 thou deeper then you can increase the PCD of the worm the same amount.The wormwheel cutter would have to be the same OD as the worm itself and you can make it from a hardenable steel, using the 2-button method to get close to the correct form. Then you'd have to set the cutter at the helix angle, index the worm for 33 teeth and plunge-cut each tooth in turn. It's not as difficult as it sounds just a bit of work.

07/01/2021 23:02:01

Yes you're right, lacking a drawing I used the figures you quote not giving any allowance for the clearance. It was more so you could compare what I think you should have with what you actually have. There would need to be a clearance allowance.

07/01/2021 22:34:47

If this is your only lathe you could start by turning the worm gear over. That would put 90% of the load on the un-worn side. That would get your auto-feeds working at least towards the chuck but probably both directions since you'll have the worn part of the worm acting on the unworn part of the wheel, and vice-versa.

Then you're going to have to figure out the gearing to get a lead of 0.174" or 4.4196mm to make a new worm using a threading tool ground to 14.5 degrees which is ACME thread angle.

07/01/2021 22:18:49

The drawing you're looking for is ML110_309 it's the drawing for the worm gear. It's a 18DP 14.5PA LH worm gear of 33 teeth left hand helix and 1.8334" pitch diameter.

Going by the specs on that drawing your worm should be I think 1.098" diameter 0.174" lead single start LH worm.

Edited By Pete Rimmer on 07/01/2021 22:26:36

Thread: DTI Stand - Single Lock Type?
07/01/2021 00:29:12

I just bought one of the cheap ones for £14. I wasn't expecting champagne taste for lemonade money so I found it quite adequate given the cost. The base sits flat and the magnet will hold a DTI and a 2" dial gauge with the arm at full horizontal extension, so I'm happy with mine.

Thread: Metric to imperial
05/01/2021 23:50:27

I would re-make the dials with 250 (or 125) graduations and save my brain from hurting.

Thread: straight shank adapter for MT2/MT3 drill bits
05/01/2021 20:49:16
Posted by Adam Harris on 05/01/2021 20:15:12:

I am struggling to find a straight shank adapter (1/2" shank would be good) for holding my MT2/MT3 drill bits to use in portable drill - can anyone steer me in the right direction please?

1. Buy a AEG/Wolf gutbuster which has a MT socket.

2. Hang on tight (or pay someone else to).

Here's an example

Edited By Pete Rimmer on 05/01/2021 20:55:57

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