The gear section on my 10L screw, which I think uses the same 12-tooth 20DP gear as the 9", is 0.700" exactly which is correct for the gear profile. With the tight sliding fit even without slitting the "collet" will compress enough to firmly grip the part.and is very convenient since the entire job can be done in that single chucking. South Bend 9 Lathe Part - Cross Slide Screw, Ball Crank, Bushing & Dial. Last edited by iwananew10K 10-16-2018 at 05:36 PM. 9 south bend lathe cross feed leadscrew rebuild kit. With the tight sliding fit even without slitting the "collet" will compress enough to firmly grip the part.and is very convenient since the entire job can be done in that single chucking.same method can be used to grip the new ACME when you turn down the end to 5/16" or so.just be sure to prepare the ACME section first as it will be your gage to do the geared portion. Ps- the geared portion on the 9" is ~.685"ish diameter.a slick way of holding it very accurately without damage and having no other means is to chuck up a piece of scrap ~3/4" or so and drill/bore it to a tight sliding fit then simply insert the geared portion and tighten the chuck a little more.basically an in-situ collet. Just gotta lock down the crosslide and use the compound.no biggie since the facing cuts are so short.Īs for the securing of the new ACME if you simply make it a nice sliding fit into the geared portion and use loctite #680 it will last at least as long as it takes to wear out the new ACME. Replacing the ACME portion is actually pretty easy and a nice little project that covers basic set up+ turn/face/drill/bore operations.
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