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Spindle depth stop

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Peter Simpson 305/05/2022 18:16:23
40 forum posts

Has anybody got a spindle depth stop for a myford S7. I need to cut some flue tubes to 11 7/8" long photo would be much very helpful.

john fletcher 105/05/2022 18:28:11
792 forum posts

Strangely enough, I am reading in MEW number 50 May/July 1998 page 27 about a back stop which I intend to make. Look out for a PM from me this evening. John

Clive Brown 105/05/2022 19:48:28
825 forum posts
41 photos

Harold Hall's web-site details the design and manufacture of a back-stop for the S7.

here

JasonB05/05/2022 19:55:12
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Moderator
22744 forum posts
2653 photos
1 articles

I would think you need something quite a bit shorter than harold's design if you are going to get a 12" length of tube in without excess length sticking out the chuck.

Cutting to a scriber mark would be adequate for something like a flue tube

Clive Brown 105/05/2022 20:32:44
825 forum posts
41 photos

My Boxford version of the HH design allows a max. length of about 14" from the chuck jaws though a Myford's probably a bit less.

I agree however that cutting boiler tubes doesn't really need a backstop, (but that's what the customer wanted!).

bernard towers05/05/2022 21:41:52
612 forum posts
109 photos

Im with Jason on this don't make it too complicated.

ega05/05/2022 22:45:01
2538 forum posts
201 photos

J A Radford shows a design in his Improvements and Accessories for your Lathe.

DMB06/05/2022 08:29:52
1312 forum posts
1 photos

Have to agree with JasonB on this. Need to assess the degree of accuracy required for the job and simple careful measuring with a rule, hacksaw and face cut end, will do, in this instance.

John

john halfpenny06/05/2022 09:02:43
236 forum posts
24 photos

A strip of masking tape wrapped around the tube will give you a perpendicular cutting line.

Hopper06/05/2022 09:30:57
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6389 forum posts
334 photos

A little tubing cutter like plumbers and fridge mechanics use could be handy too. Could be set up on a bench with a stop as simple as a block of wood for repetition work.

Roderick Jenkins06/05/2022 12:21:56
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2183 forum posts
608 photos

All good advice, even if most of is "Ooh you don't want to do it like that" wink

If you do want to do it like that:

The end of the S7 spindle is machined on the external surface:

myford spindle end 1.jpg

Make a close fitting collar that can be fastened to the end of the spindle with a couple of grub screws with brass pads to protect the spindle end

myford spindle end 2.jpg

Thread this collar for a suitable length of studding locked at the required depth with a nut

(the collar shown in the photo is actually for my depth stop which only works as a chuck depth stop and is adjusted from this end so the hole is plain. The depth is adjusted by the 40tpi thread in the 2MT blank. The collar stops it from flopping about - see below)

lathe depth stop.jpg

HTH,

Rod

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