Lathe Chuck Brake

[LMMasterMariner]

Hello again,

Another modification of my lathe (11 x 26, big brother of Grizzly G0602).

Made lathe chuck brake using motorcycle rear foot brake.

Very useful for threading if you don't disengage half-nut lever like me.
I never use threading dial, even I have it.
It can be also very useful in case of emergency when instant stop of chuck rotation
is needed. As you can see in video clip it stops chuck rotation from 2022 RPM in no time.

As chuck is screwed on and in order not to unscrew when stopped instantly, I decided to
mount brake at chuck and not on motor spindle or elsewhere. Just to be on safe side,
even there are 2 stop screws at chuck back plate, which should prevent chuck from unscrewing.

I uploaded video of that brake at youtube:

Thanks for watching.

This is lathe hand brake and it can easily be converted to foot brake, but I have
drawers cabinet underneath, so foot brake is out of question.

Two things are happening by pulling brake handle;
1. stopping electric motor using safety switch at chuck guard shaft
2. braking

Used dirt bike foot rear brake. Bought complete brake; caliper, master cylinder, hose and disc
at Taobao for less than USD 15.
https://world.taobao.com/item/539966....SBmdl9#detail

Picture 1 / Lathe Chuck Brake

Picture 2 / Brake complete for 250 cc motorbike
It can be found at ebay or aliexpress.

There is no need to buy disc as there is no room for brake caliper if original disc is mounted behind chuck back plate.
So, I also fabricated new disc. Made it from 25 mm high tensile AH36 (shipbuilding) steel plate.
It is covering chuck from behind and there is additional distance which enable this floating type motorbike
caliper to fit in.

Picture 3 / Fabricated Brake Disc drawing

Picture 4 / Lathe chuck upside down with back plate up

Picture 5 / Brake disc (also indexing) mounted on chuck back plate

Picture 6 / Small parts

Picture 7 / Base. Made of square SS bar 35 x 35 mm and mounted on the ways in the same
way as follower rest. Used under way part of follower rest to fix it on the ways.
There are no additional holes on the lathe.
CORRECTION: STEADY REST, NOT FOLLOWER REST.
======================================

Picture 8 / Throttle Cable which is laid under the ways and coming from behind the splash guard.
It is used to stop electric motor. Connected to chuck guard shaft / safety switch.

Will upload another video of assembling all these parts. Need 2 hands and must
persuade my wife to hold camera. That video will be named Stopping Small Lathe / Part 2.

Next completed project is indexing fixture for small lathe. Already done, but have no time
for another post right now.

Regards
LMMasterMariner