Spindle depth stop

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.

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

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

here

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

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!).

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

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

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

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

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.

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

If you do want to do it like that:

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

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

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)

HTH,

Rod