Member postings for Robert Butler

An update of sorts.

I tried fitting following Myford's instructions exactly including reluctantly loosening the apron screws - no improvement whatsoever!

I then tried John Paces suggestion, fitting the nut with the PX pinion in place onto the apron and then operating the PX with the main leadscrew handwheel, the pinion showed no signs of binding and rotated freely. As soon as the leadscrew was inserted taking care to mesh the pinion with the leadscrew slot the screw binds. Reinstate Metric nut, screw etc perfect.

If the Imperial nut is assembled on to the screw and the pinion fitted the screw works fine and the pinion moves without any signs of sticking or binding it is only when fitted to the apron there is a problem.

I think John may be on the right track with the depth of the slot, but cannot see an easy way of establishing the slot depth on either feedscrew to confirm this. Failing this I think there may be an axial alignment issue with the feedscrew/nut as without using force for fear of causing damage the issue is cyclical.

I would appreciate any further suggestions please.

Robert Butler

Not allot! Considering time spent collecting, loading, return to works, off loading, repair, re-load, return to customer, off-load and position. Parts?????? VAT @ 20%

Robert Butler

Edited By Robert Butler on 16/06/2021 22:56:21

Dear John

Thank you, sounds like a good suggestion but it may be the weekend before I can try this.

Robert Butler

Trevor

Thank you, I do have his contact details, he serviced the lathe back in 2017 before my conversion project. If the forum members are unable to help me solve the problem I will contact him.

Robert Butler

Dear John & Niko thank you for your responses.

The metric screw is perfect, the cyclical issue was with the first imperial screw and nut, I think the screw and nut were inaccurately machined which meant the backlash set by the collared nut varied along the length of the screw. The PX pinion does not affect backlash.

I have just tried the set up with the the replacement imperial screw and nut but omitting the PX drive pinion and the screw operates satisfactorily. With the pinion in place the screw is fine until pushing the nut the final 1/8" or so into position. whether this is the nut or pinion which is having some effect and why is unclear. The pinion and the exposed gear in the apron are undamaged as is the key which is an integral part of the PX pinion and it slides freely on the screw.

I have not yet slackened the apron and am reluctant to do this following the doctrine of unintended consequences.

The emboldened text in inverted commas is quoted from Myford's instructions. My view is that if the nut and screw are concentric they should fit.

Puzzled.com

Thank you for your help so far.

Robert Butler

Edited By Robert Butler on 13/06/2021 21:11:13

Gentlemen I am hoping the knowledgeable forum members can throw some light or confirm my suspicions please.

My Super 7 PX was purchased as a Metric Machine and I decided to convert it to Imperial purchasing the feed screws and micrometre dials from Myford. I didn't get round to fitting them for some considerable time but when I did I had a  cyclical issue with the screw or nut. It was impossible to set the backlash satisfactorily. The nut supplied was made from streel as the original.

I refitted the metric screw and nut and it was possible to adjust the backlash to less than one micrometre division and the screw and slide were as near to perfect as one has any right to expect. I tried the imperial screw again and the variable backlash problem resurfaced.

I contacted Myford who to their credit after checking the screw and agreeing there was a defect gave a fair discount toward a replacement. The new nut  was of a bronze? material. The screw and nut operate smoothly before assembly, but when assembling the nut, screw and PX pinion the action becomes extremely stiff. Tried refitting the metric screw, perfect!

I contacted Myford again who provided fitting instructions which closely mirrored the method I had been using.

"Fasten the nut and collared gear on to the screw and then fasten that onto the saddle, screw the nut all the way in before attaching the cross slide to the mounting bracket, put the two screws for the bracket in loosely and then as you're winding the whole unit out with the loose screws then tighten as this aids self aligning. Sometimes also the apron will need slackening off as this allows for the collared gear to mesh with the apron."

I am reluctant to slacken the apron, as it will then need tightening and I would think I will be back to square one! Given the metric screw and nut align and can be adjusted to perfection and the only issue with the first imperial screw and nut was the periodic backlash error it appears there is a problem with the new bronze not and screw. My view is either the bronze nut is not concentric with the screw or apron.

This is not a New Myford bashing exercise!

Any thoughts or suggestions would be very much appreciated.

Robert Butler

Edited By Robert Butler on 13/06/2021 18:34:05

Edited By Robert Butler on 13/06/2021 18:36:19

Edited By Robert Butler on 13/06/2021 18:38:32

Edited By Robert Butler on 13/06/2021 18:51:54

I have several of these oil cans and they are excellent. The flat base of large diameter perhaps gives a clue as to the intended orientation when not in use. I cannot think of any other oil can I have, or seen which would not leak when stored on its side. In fact I have Wesco's old and new which leak when stood in the upright position??!!

Robert Butler

Use an ordinary nut, it's use for what was intended is pretty much destroyed anyway.

Robert Butler

Ashtonseals.co.uk list straight, 45 & 90 degree oilers (nipples) in M7 x 1

Robert Butler

The Rishton attachment is self powered, as is the Amolco.

Peter that may be its purpose, machining eccentrics.

Robert Butler

Edited By Robert Butler on 31/05/2021 19:11:10

The Rodney uses a 2MT adaptor with a gear fitting which fits into a Nylon? drive coupling. Not sure on other types but why would you fit a chuck or collet and then a duplicate Myford nose adaptor? The Amolco as far as I can recall is self powered.

Robert Butler

I don't think so! It is solid and seems to replicate the Myford nose thread, swarf's going no where using that device.

Robert Butler

In this instance if the Carriers Insurers pay up to the limit per tonne and using the previous example they have no right to take possession of the salvage as they have not paid full value.

Robert Butler

Double posted can't delete

Edited By Robert Butler on 30/05/2021 21:34:45

In this instance if the Carriers Insurers pay up to the limit per tonne and using the previous example they have no right to take possession of the salvage as they have not paid full value.

Robert Butler

£1,300 per tonne, 250 kilo's = £325 so I wouldn't get too excited.

Robert Butler

Edited By Robert Butler on 29/05/2021 16:39:57

The Instructions give the impression it slides apart - Arrows!

Robert Butler

So much doom and gloom is attributed to the use of lead in its various guises and I have yet to see scientific evidence to support these assertions. How many deaths in wildlife and humans have a direct and proven link to lead ingestion or poisoning.

Robert Butler

Edited By Robert Butler on 23/04/2021 22:25:41

Parker Hale threads are bastard size and form, i cannot be any more helpful than that I'm afraid.

Robert Butler

Where are you based, I have a selection of BSP taps.

Robert Butler

If you are looking for Ring Open End spanners try instead for Combination spanners, ring at one end open ended at the other, Each spanner only fits one size.

Robert Butler

PS the ex Myford fitter who serviced my lathe advised Myford used the cheapest spanner sets available