Myford Super 7 gib screws

[IvyParticipant @ivy]

Can someone put a photo of the Myford Super 7 saddle adjusting gib screws please?

I need all four and the ML7 ones are available but different. Super 7 ones not available from Myford so I bought some from another place and they seem to be ordinary ML7 type although advertised as Super 7.

I don't have the old ones to see how they differ

I always get good info and help here so thanks for reading.

[IvyParticipant @ivy]

[Swarf, Mostly!Participant @swarfmostly]

Hi there, Ivy,

I can't answer your query directly. However, if you go on the Myford web-site, they have the illustrated parts lists (aka 'exploded diagrams' ) for all the major assemblies of both the ML7 and the Super 7. They are (last time I looked ) down-loadable.

Best regards,

Swarf, Mostly!

[IvyParticipant @ivy]

Thanks Swarf, but I already looked there and the pictures are not at all clear

[Mike CrossfieldParticipant @mikecrossfield92481]

Lathespares stock saddle gib adjusting screws for certain Super7 models, and there are pictures on their website.

https://www.lathespares.co.uk/myford-super-7-saddle-adjusting-screw

hth

Mije

[IvyParticipant @ivy]

Posted by Mike Crossfield on 16/03/2022 13:43:32:

Lathespares stock saddle gib adjusting screws for certain Super7 models, and there are pictures on their website.

https://www.lathespares.co.uk/myford-super-7-saddle-adjusting-screw

hth

Mije

That is "the other place" I mentioned.

I don't want too take it up with them until I am sure of what's what.

[Grindstone CowboyParticipant @grindstonecowboy]

Well, there's really only two ways they can be wrong, either length or thread (or both). If they screw in and they are long enough to take the lock-nut with a bit extra, then they'll be fine.

Rob

[DiogenesIIParticipant @diogenesii]

FWIW (as an ML owner) I think it depends on your machine – there's at least two types of screw, an 'early' one with a round end, and a 'late' one which used dog-points to locate the gib..

..but I'm a bit out of my province with S7s.. ..if no-one else comes along, tell us whether the gib-strip has 'divots' for location, or whether there are through holes or a rebate…

[IvyParticipant @ivy]

Posted by Grindstone Cowboy on 16/03/2022 14:31:20:

Well, there's really only two ways they can be wrong, either length or thread (or both). If they screw in and they are long enough to take the lock-nut with a bit extra, then they'll be fine.

Rob

Rob, here is the problem.

The ones I have are threaded on the outside end only for about a 1/2 inch or so, this means that the thread does not meet the female thread in the saddle. The saddle screw holes are counter bored too deep. So I think the correct ones must be threaded the full length or nearly full.

The reason I need to see the correct factory fitted ones is so I can compare with what was sold to me as "Super 7" screws. Their sales description maybe wrong or I have a perculiar Myford.

[IvyParticipant @ivy]

Posted by DiogenesII on 16/03/2022 14:52:14:

FWIW (as an ML owner) I think it depends on your machine – there's at least two types of screw, an 'early' one with a round end, and a 'late' one which used dog-points to locate the gib..

..but I'm a bit out of my province with S7s.. ..if no-one else comes along, tell us whether the gib-strip has 'divots' for location, or whether there are through holes or a rebate…

The gib has one through hole for the third from left screw to locate into and hold the gib in place. I don't have access to the machine until tonight.

[Grindstone CowboyParticipant @grindstonecowboy]

See your point. If you turn them around, will they screw in successfully – which will at least prove they have the correct thread (2BA IIRC). But if the whole length of the thread is taken up by the counterbore before it engages, then definitely the wrong screws OR a modified lathe. I can't think why the holes would need to be counterbored?

Rob

[ChrisLHParticipant @chrislh]

My S7 is rather old which might make a difference (SK 2142) but here are the dimensions of the screws I have extracted from the second and third holes, both the same.

Overall length 1.875

0.250 BSF threaded length 0.650

Slotted for flat blade screwdriver on the threaded end

Plain end approximately spherical

[Grindstone CowboyParticipant @grindstonecowboy]

Chris, just as a matter of interest, are the holes in your S7 counterbored?

Thanks, Rob

[speelwerkParticipant @speelwerk]

Not from the UK but these seems the ones you are looking for, Niko. **LINK**

[John PurdyParticipant @johnpurdy78347]

Ivy

On my S7, serial # SK127323 mfg 1976, the screws are all 1/4 BSF threaded full length, screwdriver slotted end. Lengths as follows left to right: 2.750 round point, 2 910 dog point, and 2.750 round point. The holes in the saddle are counter bored .275 dia. by 1.950 deep.  Hope this helps.

John

Edited By John Purdy on 16/03/2022 17:09:42

[DiogenesIIParticipant @diogenesii]

In the only copy of the S7 manual that I have (PXF), it shows three screws; so it probably ain't that one; it uses screws A9183 (2 off), and A9184 (1 off).. ..I think it's these screws you got from L/spares

ON the basis that you have four screws, I think your model is the Non-PXF one –

Myford Ltd supply a parts drawing of the Non-PXF carriage which shows four screws;

(K53) Part No A7760 Saddle Gib Adjusting Screw, 3 off

(K58) Part No A 7424/1 Gib Strip Adjusting Screw, 1 off

Hexagon Lock Nut (1/4" BSF), 4 off

Copy of dawing here

Myford Ltd – Super 7 Carriage Assembly Non Power Cross Feed

..it still doesn't help much with comparison, I couldn't even find a picture of these screws under either part number..

Edited By DiogenesII on 16/03/2022 17:04:38

Edited By DiogenesII on 16/03/2022 17:05:17

[IvyParticipant @ivy]

Well it looks like mine should be like the ones in speelwerks link and John Purdy has.

Chris H has the ones I bought by mistake, but these are the same as the ML7 I think.

As always model-engineer has helped me again.

Thank you all.

[ChrisLHParticipant @chrislh]

Rob,

No, the holes are not countersunk.

John,

Surprising that later screws are so much longer than older ones.

[speelwerkParticipant @speelwerk]

They are longer because the later S7 has power cross feed therefore the apron is wider to accommodate the gears for it. Niko.

[IvyParticipant @ivy]

My lathe is 1962/63 and needs the same as John Purdy's 1976 lathe.

Mine must have had a replacement saddle at some point.

[John PurdyParticipant @johnpurdy78347]

I should have said my lathe is a S7B with power cross feed. As Speelwerk says the saddle and the apron are different from the earlier non power cross feed model, thus the screws will be different.

John

[IvyParticipant @ivy]

Posted by John Purdy on 16/03/2022 18:52:49:

I should have said my lathe is a S7B with power cross feed. As Speelwerk says the saddle and the apron are different from the earlier non power cross feed model, thus the screws will be different.

John

This is giving me brain ache now.

The screws I need are the same as yours, but I need four not three and my lathe is not power cross feed.

I didn't think Myford were into making random changes on a whim, but maybe they were.

[Alan DonovanParticipant @alandonovan54394]

Hi Ivy.

I have been following this post w.r.t. your gib screw problems on your Super 7.

Myford (the Beeston, Nottingham version) were not into making 'random' changes. I served my engineering apprenticeship there (68-74) and any changes to their products were very carefully controlled and recorded.

I feel that I can say with some certainty, that your counterbored holes are definitely non-standard, as to produce 4 counterbored holes are 4 extra machining operations, which is additional cost.

In addition to this, Myford policy was to use as many 'common' parts between all their machines as possible to benefit from the economies of mass production. So the ML7 and S7 saddles were probably the same part at that time your lathe was manufactured, so you probably have the correct gib screws as per original design intent.

With respect to your problem, it looks like it may be an owners modification. May I suggest that you undertake a detailed survey of your gib strip and the saddle holes. With this information you can design a set of bespoke gib screws to suit your saddle.

It seems as this may be the only way out for you.

I hope this helps

Alan

 

Edited By Alan Donovan on 17/03/2022 12:10:59

[HopperParticipant @hopper]

Possibly a previous owner could not get, or did not want to pay for, the correct long Myford screws so drilled out the outer thread, tapped the inner part of the hole and used common-a-garden shorter grub screws from his local bolt supplier.

Alan, serving your time at Myford in that era would have been an interesting experience. That was about the end of the great industrial era when such things could be done. I was in the UK a few years later and you could not get an engineering job to save your life. Everything had shut down by 1980. Shame.

Edited By Hopper on 17/03/2022 12:16:40

[IvyParticipant @ivy]

Alan, thanks for coming into the discussion.

What you say about Myford (Beeston) not making random changes is what I have always thought and must respect your experience.

I think the counter bores must be a later modification by a previous owner. Although I can't imagine why.

Anyway I have ordered some 1/4 BSF studding to hold everything in place temporarily and then I can make something more satisfactory.

Thanks again all.

[Author]

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