Round Magnetic Chuck for Lathe

Thanks, Will. Personally, I would have preferred if Yuasa made it themselves but as long as it works, I'm good.
 
How are you guys going to mount these?
I see on the Braillon site some are mounted on what looks like a MT flange. Looks very interesting.
 
Just screw it onto a D1-4 backing plate. Even if the mount isn't dead on, you indicate the part before fully engaging the magnet so the part will run concentric with the spindle. I cannot even count the number of times I needed a thin part faced accurately on both sides and of a precise thickness; this should do the trick.
 
Yup, like Mike said, exactly like how you would mount any other plain back chuck.

I got my backplate today, gotta love Amazon same day shipping! Unfortunately I'll have to wait a couple of weeks until I recover before I can start working on it (had surgery this past Fri)

Mike, another odd difference with mine. Mine has a 125mm register with a 4 hole mounting bolt circle of 140mm.
 
I plan to leave a bit of room between the registration boss on the back plate and the hole in the chuck so I can knock the chuck into close alignment. This chuck will not see much, if any, side force so I do not think it important to machine it too close. I would rather have it accurately aligned so it runs without vibration but I won't obsess about it ... well, not much more than I normally obsess about such things. :confused:
 
Yup, good idea. Will be perfectly fine with this chuck. That's what I did with the original China 3-jaw that came with my lathe. I call it Tap-Tru. :)

I decided to keep it & use it for "dirty" work, sanding, polishing, CI, etc. I haven't done any heavier machining on steel with it but it hasn't slipped on me yet. It actually holds pretty good.

I think I'll start out machining mine with a close fit to see how the runout is. If it runs out considerably I'll go with the Tap-Tru method too.
 
darkzero said:
Yup, good idea. Will be perfectly fine with this chuck. That's what I did with the original China 3-jaw that came with my lathe. I call it Tap-Tru. :)

I decided to keep it & use it for "dirty" work, sanding, polishing, CI, etc. I haven't done any heavier machining on steel with it but it hasn't slipped on me yet. It actually holds pretty good.

I think I'll start out machining mine with a close fit to see how the runout is. If it runs out considerably I'll go with the Tap-Tru method too.
Click to expand...

I like that - Tap-Tru!

My Samchully chuck manual recommends that the user make the boss 0.01 mm (~0.0004") smaller than the hole in the chuck. This is contrary to common practice but the supposition is that you will indicate the chuck in with an accurate pin so Samchully agrees with the Tap-Tru technique. I do, too.
 
Oh wow, you have a Samchully chuck!?! Those are nice!

I don't think I'll ever get to replace my Bison chucks with nicer ones but that's ok. At least I can drool! I love a good looking quality chuck, aka chuck porn. :)
 
Yeah, Samchully makes really nice chucks. I only have one of their 3 jaw chucks but it is smooth as silk with no discernible play. I have two Rohm/Emco 3 jaw chucks and two Rohm/Emco 4 jaw chucks. Gotta' have back ups, right? I've sworn off buying any more chucks because I'm pretty sure I have enough of them.

Unlike someone I know, I don't have a Bison 6 jaw Adjust-tru. :)
 
Finally got back to this & finished making the back plates. I didn't end up facing it. It cleaned up pretty nice, a bit too nice, wasn't expecting this much shine. I hit the face with scotchbrite & the OD with some sandpaper. Got really lucky, the body only had just under 1 thou run out & for the face basically none. DI really didn't show any runout, just slight movement from the surface finish. I'll check it later with a tenths indicator.

Here's what it looked like before clean up.
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And after.
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Then put the name plate back on.
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Also made a backplate to mount on the rotary table.
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Unfortunately I wasn't so lucky with this one. Getting about 1 thou variance. I'll figure out what's going on with that some other time. Edit: Fixed that here.20190213_181118.jpg
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Needed to make a spacer faced & parallel on both sides with the bore square to the faces. Came out pretty good & I'm happy.
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Here's what it started out as, a slug from an annular cutter.

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