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Yuasa Round Magnetic Chuck for Lathe

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darkzero

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Some of this is from the other thread here. Mainly adding to my archive.

Got a 6.3" Yuasa round magnetic chuck a while back to use on the lathe. Mainly to work on thin parts & machine parts flat (parallel on both sides). Not meant to take heavy cuts (think surface grinder), just light skimming is what I'll be doing with it. I haven't got fully comfortable with how strong it will hold various sized parts yet but getting there. So far I'm happy to have this in my arsenal.


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Used a South Bend branded 8" D1-4 back plate from Grizzly to mount it. Took quite a while to get it down to 6.3" but it was worth it.
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Here's how it looked when I got it.
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A bit of light sanding & scotchbrite cleaned it up very nice. I decided not to skim the face or grind it just yet.
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Just with clean up it only had about .001" runout on the body & .0002" rounout on the face, +/- .0001" depending on where I measure it. Didn't see a need to face it at this time.
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It came with the original key (square rather than hex like most others) but I wanted one with a bit longer handle. 7mm square keys are hard to find so I thought for sure I would have to make one. Found one from Myford, even coming from the UK it was a good price & good quality. Handle was way too long so I shortened it.
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First thing I made. I needed a spacer for my slitting saw arbor. Wanted it as flat as possible so it wouldn't add any runout which was a success.
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darkzero

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I also made a backplate to mount on my rotary table. With the same backplate I can bolt it to the mill table. I may never use it on the mill buy ya never know. :)

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Making the backplate.
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In the other thread I mentioned that this one did not come out that great & that I would get back to it later. Did that today. I got a bit over .001" difference over the 6.3" face.
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What better way to try & fix it than with the mag chuck! ;) Used a bull center to hold it up against the mag chuck, then bumped it true.
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I use these copper slugs for knocking things around. They're perfect to use with the mag chuck. The pinion adds magnetism gradually. I turn the pinion about 1/2 to 3/4 of a full turn depending on the size, bump true, then fully turn.
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Here's what I measured. About a thou of axial runout cause of the variation in thickness.
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Ok, laugh, tease, make fun of me all you want but I was a bit scared. :big grin: I didn't know what to expect spinning an 8" dia x 3/4" thick piece of cast iron even though it was only going to be a skim cut. I yanked on it pretty hard & couldn't budge it. Still, I used two MT extensions as a safety catch (don't mind the annular cutter arbor, tried that before adding the second extension & just left it in). Even it if it knocked loose I'm sure it wouldn't have completely seperated but better safe than sorry.
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No dramas. Surface finish didn't come out as great as when I first made it but whatever, it's the bottom. Here's what it ended up at. That's consistent with the axial runout of just the chuck. Good enough for me!
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Thanks for looking!
 

mikey

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Awesome, Will! I would definitely be happy with 3 tenths over 8". As always, very nice photo-documentation and text - very clear. Its stuff like this that make other guys want to run out and buy tools ... you know that, right?

Have fun cleaning up all the cast iron. I still haven't gotten around to mounting my chuck; must be a subliminal wish to avoid clean up!
 

darkzero

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Awesome, Will! I would definitely be happy with 3 tenths over 8". As always, very nice photo-documentation and text - very clear. Its stuff like this that make other guys want to run out and buy tools ... you know that, right?

Have fun cleaning up all the cast iron. I still haven't gotten around to mounting my chuck; must be a subliminal wish to avoid clean up!
Haha, thanks Mike! I have been one of those accused to be the cause of people spending their money when I first came here. One person even told me that his wife hates me. I hope he was just joking.

Yeah I'm pretty happy with the result. I was surprised actually, I measured like 5 times with 2 different mics. I'm not used to getting results that close in tenths. ;) This thing is pretty cool, I know you will love yours too once you get it mounted!

Oh the CI, I already took care of. I did most of the work on the backplates on 2017. That's where I left off. Only had to drill the bolt circles to finish them off. I hope I never have to make that much of a CI mess again.
 

mmcmdl

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Will , we used to use them on our universal grinders . Surprisingly , they hold pretty good . I've mounted them on lathes also and had great results with them . You'll get the occasional ooops and your part will move , but it usually does not end up in a scrapped part , rather just having to find it in your machine bed . Nice set-up there . :encourage:

Double back tape was used on some jobs and it worked ok , but trying to remove the part afterwards was quite the chore . I did some thread grinding years back , and we would Loctite the mold cores to a plate and pic up the existing threads . Never had one break off ! A quick wrap with a brass hammer shocked the piece off .
 

mmcmdl

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On a side note , you could do that on a SG ………………….














and I just happen to know where one is ! :big grin:
 

mmcmdl

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Awesome, Will! I would definitely be happy with 3 tenths over 8". As always, very nice photo-documentation and text - very clear. Its stuff like this that make other guys want to run out and buy tools ... you know that, right?
Funny Mike , I don't need to read documentation OR look at cool pics , I seem to just buy tools for the heck of it ! :grin: I figure there are more worst ways to waste my money . :encourage:

That is good looking set-up he has there , AND very useful.
 

darkzero

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Will , we used to use them on our universal grinders . Surprisingly , they hold pretty good . I've mounted them on lathes also and had great results with them . You'll get the occasional ooops and your part will move , but it usually does not end up in a scrapped part , rather just having to find it in your machine bed . Nice set-up there . :encourage:

Double back tape was used on some jobs and it worked ok , but trying to remove the part afterwards was quite the chore . I did some thread grinding years back , and we would Loctite the mold cores to a plate and pic up the existing threads . Never had one break off ! A quick wrap with a brass hammer shocked the piece off .
Thanks Dave. Is that what round mag chucks are mainly used on, universal grinders?

Yup, I quickly learned making that spacer. Had very little surface area so it kept knocking loose. That particular part never fell.off the chuck though, it would just slide.off to the side. Had to take very light cuts with a very sharp tool to get it done


On a side note , you could do that on a SG ………………….














and I just happen to know where one is ! :big grin:
Haha, as much as I would really really really really really love to have a SG I don't have the room for one. :frown:
 

mikey

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Funny Mike , I don't need to read documentation OR look at cool pics , I seem to just buy tools for the heck of it ! :grin: I figure there are more worst ways to waste my money . :encourage:

That is good looking set-up he has there , AND very useful.
Yeah, I seem to buy tools without Will's help, too, but he does make things worse. He made me want an Eagle Rock knurler so bad that I went and bought one. I'm glad I did but I will forever get to nag him about it! ;)
 

darkzero

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Yeah, I seem to buy tools without Will's help, too, but he does make things worse. He made me want an Eagle Rock knurler so bad that I went and bought one. I'm glad I did but I will forever get to nag him about it! ;)
Just being here is a problem! We all do it to each other though. Why do you think I created the following thread? ;)


Haha, the knurler! Mike made me buy a TE-CO clamping set to replace the import set that came with my mill. Well maybe not made me but he made one want bad as well. :D

It's still sitting in the box, I need to get it set up & mill the t-nuts. Thank you for the reminder!
 

mmcmdl

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All our B&S , TOS and Landis universals had them . Once we had the flat surface we could just bump the ODs in and grind away . These were mostly large HT dies . I once had the opportunity to find out just how well the chucks would hold onto a cam . I indicated the wrong throw ( with my bosses Last Word ) , rapid fed the wheel in and realized I indicated the wrong lobe . It was pretty cool ! Never knew how many parts were in a Last Word indicator before among other things . Couple of bumps on the cam but it stayed on that mag chuck , but think something came loose in the back of my pants . o_O
 

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Thanks Dave. Is that what round mag chucks are mainly used on, universal grinders?

Yup, I quickly learned making that spacer. Had very little surface area so it kept knocking loose. That particular part never fell.off the chuck though, it would just slide.off to the side. Had to take very light cuts with a very sharp tool to get it done




Haha, as much as I would really really really really really love to have a SG I don't have the room for one. :frown:
Block the part in with more steel to give it more support, if possible. Not always possible, but very often is. Surface grinder users usually learn that technique quickly.
 

mmcmdl

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Yes , we had V shaped supports . Added support and also helped when locating your next part . Usually a couple thou TIR .
 

darkzero

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Block the part in with more steel to give it more support, if possible. Not always possible, but very often is. Surface grinder users usually learn that technique quickly.
I thought about it but didn't really have anything on hand since it was so thin (1/8"), I mentioned it in the other thread.

When I took the machining courses at the local college with my lil brother the tool room guy always took the time to try and teach us how, why, & when to block parts in. All the SGs were placed at an angle with a window inline of the left side of each machine. No one threw a part while I was there but 2 broken windows showed that it did happen.
 

darkzero

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Yeah, I seem to buy tools without Will's help, too, but he does make things worse. He made me want an Eagle Rock knurler so bad that I went and bought one. I'm glad I did but I will forever get to nag him about it! ;)
Ah, now I remember, here is the last thing Mike led me to buy. Very happy that he gave me the lead on it though. $100 was dirt cheap!
 

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mmcmdl

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Our SG's were placed the same , and we had a few broken panes also ! The large Blanchards were right on the other side of the wall . When you heard the gatling gun go off , you know what happened ! :grin::grin::grin:
 

darkzero

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Gotta' admit, that was a smoking deal you got on that one, Will.
Yes it was. Luckily one of my brothers lived somewhat close by the seller at the time, orthewise it would have been a very long drive for me. Thanks again!

A new box for it is getting made for it right now by a member here. That's what that block of alumn is for, a dummy for fitment.
 

MarkM

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I am interested in the depth gauge you may sell if it s of decent quality. You had to put that carrot out didn t you? Were all addicts no matter how much we try to control our spending! Where is the machinist clinic? I am in need of help as I can t contain myself everytime there may be a chance for a bargain.
 

Nogoingback

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Have fun cleaning up all the cast iron. I still haven't gotten around to mounting my chuck; must be a subliminal wish to avoid clean up!
Mike, have you ever tried attaching your shop vac hose to the tool post? Tape, cable ties, whatever will work and it sends about
95 percent of the chips right down the hose.
 

mikey

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Yup, I've done that in the past and will do it again. To be honest, I have three chucks to mount and have put them all on the back burner because I'm too lazy to cover everything up before turning the back plates. I'll do them all at once and I'll remember the vac hose - thank you!
 

MarkM

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I cover with foil. Cover your ways first then a second pc. Of foil taped on to your crosslide that overlaps the first pc. Through all your motion. Good quality tape!
 

Jubil

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"Yup, I quickly learned making that spacer. Had very little surface area so it kept knocking loose. That particular part never fell.off the chuck though, it would just slide.off to the side. Had to take very light cuts with a very sharp tool to get it done"

I wonder if placing other parts on magnet (more surface area) to hold the work in place would help, like is done on surface grinders. Just thinking out loud.
Chuck
 

MarkM

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Depending on style of chuck and jaws . You can take off(screw type to reverse) your master jaws and machine washers and such to be able to use the face of the chuck to keep it square.
 
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