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Neither, AFAIK. They advertise as “aerospace tubing” some variety of chrome-moly. And yes, I was a serious cyclist in the 70s-80s. Gary

??? ??? Were those Viscounts Renyolds or Columbus tubing ? ??? animal

Adam, I'm sorry to learn you need to sell your 9A. I know how I'd hate to part with my 9C! Will you still be in the group? Will you still have your hands in making things? I ask out of 100% self

True, but both spindles have the integral 20 DP gear. BTW: I have the left-hand half-nuts for the 405 for sale(N.O.S.) Ted

Oh yes. The 405 thrust bearing is a washer. ABC spindles are ball and race. That creates a size problem. Jim B,

The ABC spindle is the lower picture. (Actually it’s a 10K spindle). Jim B, -- Jim B

I found these. Above 1.375 1.5 spindle Jim B, -- Jim B

Another thing I just remembered. The 405 used 20 DP change gears. ABC use 18 DP. Jim B,

Thank you for the info Tom For some reason the download file you sent me popped up with an add to purchase adobe premium to view the file... wrote:

I dug this up. It may help Jim B, -- Jim B

Welcome I am a former owner of a 405. The ABC spindles will physically fit on the diameters but there’s an issue with the length. I don’t remember exactly what but I believe it can be over

Hello all New to this group restoring a nice condition 405-y shipped dec 1934 Can anyone tell me if the 1 1/2 8 spindles from model a b c will fit the 405? Is there a felt replacement kit available

They are dual v-belts. The crown is still there. They tend to stay in the middle until heavy load is applied. The flange will hit the top of the v and yes will occasionally wear the outer belt edge,

Rick, if you add a flange to stop the belt wandering off, it will chew the edge of the belt, and the belt might even climb onto it. ?Flat belts need a crowned profile on the pulley, and you should

Thost truck transmission mods were pretty popular back in the day as the kids say . I always wondered if there was a article in a old,old Popular Mechanics or like mag showing the mod . animal

Just to throw another thought in the discussion. I inherited a 1922 15”. It came converted to top mounted 4 spd truck transmission driven by the original motor. It has twin v-belts from the motor

9A has a listed speed of 1270 rpm. I have a tach on my SB13. ?If I run the VFD at 60 hz in high gear, it shows within 10-20 rpm of the factory listed speed of 940 rpm. ?I have turn the frequency up

??? I think the top speed for my 9A was 1000 RPM . Pretty sure ya can set limits on the VFD . animal

My concern is the plain bearings in the headstock. I don't run either my SB9A or my SB13 much above the listed top speed of either lathe.

Well, I have decided against eliminating the step pulleys.? It would be much more complicated than just replacing the motor and installing the VFD.? Then I will have full options available as to