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Myford Power Cross Feed Screws & Nuts

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Robert Butler07/08/2016 22:12:28
158 forum posts
6 photos

I purchased a nice Super 7 at Easter and am in the process of converting it from Metric to Imperial, a simple matter of component substitution which i have almost completed.

Regrettably Myford are out of stock of Imperial Power Cross feed screws and nuts. I first phoned shortly after purchase and was quoted 3-5 weeks for delivery which was fine, i have however reminded on several occasions and on the most recent call i was told they cannot give a date when stock will be available.

Before purchase and in deed prior to contemplating the purchase of this lathe i came accross an advert on the internet offering high quality replacement feed screws and with a bronze nut as i recall.

The purpose of my post is to see if anyone has a Power Cross Feed screw and nut available which must be in good order or direct me to a source of supply.

Robert Butler

speelwerk07/08/2016 23:20:41
375 forum posts
1 photos

You probably came accross these **LINK** , they are for a ML7 and I do not think they have a imperial version, but you can always ask. Niko.

Edited By speelwerk on 07/08/2016 23:23:17

Edited By JasonB on 08/08/2016 08:22:29

Chris Evans 608/08/2016 09:28:37
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1747 forum posts

Not sure if they do imperial sizes but I bought lengths of feed screw and nuts from Automotion Components.

When searching for a lead screw supplier some of the UK sites did list imperial. A bit of simple machining and I have two cross slide feed screws and nuts plus enough lead screw for a third spare all for around £70.

Google lead screw loads out there.

KWIL08/08/2016 09:34:19
3308 forum posts
63 photos

Whatever you buy (apart from a Myford spare) you will need to machine a drive slot along its length to engage with the drive pinion in the saddle.

Robert Butler08/08/2016 11:21:15
158 forum posts
6 photos

Thank you for the replies to my posting, i am not sure if "Myford" will source replacement lead screws. i was hoping someone had a power cross feed lead screw and nut available to purchase.

The lead screws advertised on the link are metric and although available for the Super 7 are not power cross feed.

Robert Butler

John Stevenson08/08/2016 11:31:12
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Moderator
5068 forum posts
3 photos

Try **LINK** http://www.latheparts.co.uk/

 

Or **LINK**    http://www.lathespares.co.uk/myford-super-7-spares

Edited By John Stevenson on 08/08/2016 11:32:30

speelwerk08/08/2016 12:29:51
375 forum posts
1 photos

The lead screws advertised on the link are metric and although available for the Super 7 are not power cross feed.

Robert Butler

Yes, but you asked where that advert was with the bronze nut. Under connoisseur spares Myford lists the imperial leadscrew as available. **LINK** Niko.

KWIL08/08/2016 12:39:28
3308 forum posts
63 photos

www.latheparts.co,uk is an OK, have dealt with him in the past.

Not sure whether the Connoisseur and Super 7 screws are the same size.

speelwerk08/08/2016 12:43:01
375 forum posts
1 photos
Posted by KWIL on 08/08/2016 12:39:28:

www.latheparts.co,uk is an OK, have dealt with him in the past.

Not sure whether the Connoisseur and Super 7 screws are the same size.

I stand to be corrected, but as far as I know they have the same saddle. Niko.

Robert Butler08/08/2016 13:20:54
158 forum posts
6 photos

Dear Niko and others who have responded, i have checked with Myford and whilst it may be possible to use the Connoissueur screw substitute parts are required as the design differs and they are also out of stock.

Other sources as yet have not produced results, thank you all however and any other suggestions gratefully received.

Robert Butler

duncan webster08/08/2016 16:45:37
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2798 forum posts
41 photos

Suggest you leave the metric one in and fit a DRO system, then you can work in either.

Robert Butler12/08/2016 13:59:33
158 forum posts
6 photos

Thank you all for your help, i have now successfully obtained a new imperial power cross feed screw and nut.

Robert Butler

not done it yet12/08/2016 20:45:32
5023 forum posts
20 photos

Duncan,

I'm m with you.

The one and only positive for changing back to Imperial is in thread cutting imperial thread forms. As you say, better to have learned metric - sooo much easier! Imperial measurements are only useful for converting imperial drawings to, say, 1/4 scale as far as I can see. Any particular length, area or volume will be the same length, area or volume whatever units one might specify. It will not change just because one calls the units something else.

Most 'imperial ' bearings have been metric ones for years, the Americans reportedly missed Mars with one probe due to someone using an incorrect factor for converting their units to metric (yes, space travel calculation/iterations are done by computer using metric numbers, not feet and inches!). What about degees in a circle, for instance? Used in both systems but derived from what? Multiple factors is one suggestion. Perhaps we should adopt radians or even astronomical space unit these days. All have their place in science, but some are better than others in different fields. Railway lines - the width of two horse's rear ends? The furlong - how far a couple of oxen could drag a plough before needing a rest (while turning around). Even the Fahrenheit scale of temperature was a current unit, at the time, adjusted for a different zero point (which does not hold true innthe light of scientific development - zero Fahrenheit is no longer the lowest temperature attainable).

My lathe uses Imperial scales, but my vertical mill is metric. Makes no odds (apart from screw cutting) when dro's are fitted. Remember, too, that 'thous' are metric in nature (powers of ten).

Bandersnatch12/08/2016 22:09:54
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1719 forum posts
60 photos

I'm confused .... the OP seems to be talking about a (Power) cross feed screw while several responses seem to be referring to (Z-axis) leadscrews.

Richard Black 224/03/2020 12:32:26
4 forum posts

Hello there,

Sorry to be joining on an old post but would be very grateful if anyone could tell me the dimensions of a super7 power feed cross slide nut and screw please?

I have a Warco 720 (super7 Taiwanese copy) which is not a bad lathe but the nut seems to be worn and I would like to try and find out if the Myford one will fit.

I would be very grateful if anyone could help please.

Thank you very much,

Richard.

peak424/03/2020 13:27:20
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1197 forum posts
143 photos
Posted by Richard Black 2 on 24/03/2020 12:32:26:

Hello there,

Sorry to be joining on an old post but would be very grateful if anyone could tell me the dimensions of a super7 power feed cross slide nut and screw please?

I have a Warco 720 (super7 Taiwanese copy) which is not a bad lathe but the nut seems to be worn and I would like to try and find out if the Myford one will fit.

I would be very grateful if anyone could help please.

Thank you very much,

Richard.

I too have one of those, but unfortunately can't assist with the query as my real S7 is pre Power xFeed
I don't suppose yours came with a manual did it?

Hello and Welcome by the way.

p.s. I can confirm that the 33/34 tooth gear wheel addition works OK for cutting metric threads, though I needed to get a genuine Myford drive gear to mount them on.

Bill

John Haine24/03/2020 14:21:39
3343 forum posts
178 photos

img_20200324_140416016_hdr.jpg

Here's a photo of the LS off my S7+ (big bore). Nut is steel, OD 0.904", Flange OD 1.62", across flat 0.865. LS dia is 0.5, this is 2 mm pitch. Length of thread is ~8". Normally the gear (which has an internal key mating with a keyway you can't see in the photo) goes the other side of the nut and engages with the PXF mech in the apron. I don't use this because my lathe is CNC converted and has a ballscrew, but I'm keeping it with the lathe in case the next owner wants to go back to manual.

John Haine24/03/2020 15:38:21
3343 forum posts
178 photos

Just to add that the LOA of the nut is 1.25 and the flange is 5/32 thick (I think).

Richard Black 225/03/2020 21:43:47
4 forum posts

Thank you Bill and John,
Sorry about the delay thanking you but my last attempt to post failed.
I am afraid I don't have a manual for the Warco Bill but thanks for the info about screw cutting. What do you think of your machine? I am also a bit puzzled about lubricating it. I have stripped some of it down and cleaned the grease out of the gearbox and replaced all that with oil but obviously have kept the taper roller bearings on the spindle greased (new bearings). I haven't stripped out the saddle to clean out grease yet but am assuming I clean all the grease out and replace it with oil and keep regularly oiling it. Is that what you do?
Thanks John for the very detailed dimensions for the screw and nut. That should furnish me with all I need to decide if the Myford one will work. I will post back when I have checked it all out. Unfortunately it looks like Myford have shut down as I can't get any response from them. I know Warco are shutting down shortly but they don't have any spares for the old Taiwanese Myford copies.
Thanks again to both of you.
Keep safe,
Richard.

Richard Black 225/03/2020 21:43:48
4 forum posts

Thank you Bill and John,
Sorry about the delay thanking you but my last attempt to post failed.
I am afraid I don't have a manual for the Warco Bill but thanks for the info about screw cutting. What do you think of your machine? I am also a bit puzzled about lubricating it. I have stripped some of it down and cleaned the grease out of the gearbox and replaced all that with oil but obviously have kept the taper roller bearings on the spindle greased (new bearings). I haven't stripped out the saddle to clean out grease yet but am assuming I clean all the grease out and replace it with oil and keep regularly oiling it. Is that what you do?
Thanks John for the very detailed dimensions for the screw and nut. That should furnish me with all I need to decide if the Myford one will work. I will post back when I have checked it all out. Unfortunately it looks like Myford have shut down as I can't get any response from them. I know Warco are shutting down shortly but they don't have any spares for the old Taiwanese Myford copies.
Thanks again to both of you.
Keep safe,
Richard.

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