Help finding a Vertex VKC-8 chuck

[jlficken]

Does anyone have any idea where to find one of these for my incoming Vertex 8” rotary table?

I’ve searched and search but keep striking out.

I’ll also need to figure out how to attach it with the through bolts to the t-slots in the table.

 

[mmcmdl]

There is a 6" with back plate for an 8" RT on Ebay . For an 8" chuck , you would machine a subplate to fit the table (4 holes) and drill and tap 3 holes for mounting your chuck . Not a big issue if you need the 8" .

 

[darkzero]

Does it specifically need to be that Vertex chuck for some reason? There are other options & for less money. If you get a front mount chuck you could bolt the chuck directly to your rotary table with just long bolts & t-nuts, no backplate needed, assuming your rotary table has 4 slots instead of 3.

Search for K72-200. It will be sold under various familiar & generic brand names which will vary in price.

Do you need it to be 4-jaw independent? I didn't so I just went with a scroll chuck & a backplate which I can just dial in when mounting the backplate to the RT. I also have an 8" Vertex RT but I decided to go with a 6.25" chuck & a backplate for a few reasons. Weight being an important factor.

The smaller chuck & backplate allows me to bolt the chuck directly to my mill table which has came in handy quite a few times for me.

 

[jlficken]

Does it specifically need to be that Vertex chuck for some reason? There are other options & for less money. If you get a front mount chuck you could bolt the chuck directly to your rotary table with just long bolts & t-nuts, no backplate needed, assuming your rotary table has 4 slots instead of 3.

Search for K72-200. It will be sold under various familiar & generic brand names which will vary in price.

Do you need it to be 4-jaw independent? I didn't so I just went with a scroll chuck & a backplate which I can just dial in when mounting the backplate to the RT. I also have an 8" Vertex RT but I decided to go with a 6.25" chuck & a backplate for a few reasons. Weight being an important factor.

The smaller chuck & backplate allows me to bolt the chuck directly to my mill table which has came in handy quite a few times for me.

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It doesn’t have to be Vertex or necessarily 4-jaw to start. I just saw they have 4 holes and my table has 4 slots. Is that a Vertex backing plate you have as I could never find a picture of a 6” Chuck on the 8” backing plate that Vertex sells. Your setup would work for me but I’m kind of lost without being able to see how things work and all of the website pictures suck.

 

[jlficken]

For example I see this setup, however, I’m not sure if it’ll work on my rotary table to mount the backing plate to the table as the chuck and plate look to be the same diameter.

 

[mksj]

That should work, you basically need 4 mounting bolts at 90 degree intervals and T-Nuts. With a scroll you will need to adjust it so everything is on center when clamped. Some rotary tables come with a Set-Tru style chuck on a back plate for micro adjustments. A 4J independent chuck could also be used, but a bit of a PTA to dial in the work every time, but worthwhile for non-round stock or off center work. On my rotary table I mostly use a 3J 6" scroll chuck, and have a 8" 4J independent chucks as well as the a 8" T-slot plate. It is a Super-Dex, about 135 lbs with the chuck mounted.

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[darkzero]

Yeah, there are not very many ready made to purchase options for the setup I showed. I made my own backplate. I'm surprised there aren't more options available. I remember seeing them for 5" chucks, I had one for my old 6" RT.

I don't have any pictures of just the finished backplate by itself. These are the only ones I have right now.The one with the numbers shown mounted in the lathe is for my mag chuck to mount on the RT or mill table. I've never used it that way, just made that backplate for the heck of it but it's pretty much the same as the other backplate.

 

[mmcmdl]

The plate diameter doesn't matter as long as the 4 mounting holes can be used on your RT . You have an 8" rotary table , so mounting holes may be 6 1/2 " BCD . Once mounted , its easy to drill and tap for whatever chuck you decide but the chuck has to have thru holes . You could also mill a diameter in the plate to fit the chuck counter bore if it has one . It would allow easier centering . FWIW , I used a 6" Buck on 10" RT . If I needed something larger , I just mounted a large plate . IE , circle milling .

 

[mmcmdl]

Will beat me to it as always , but his pic shows exactly how it's done .

 

[darkzero]

Here's a ready made backplate. They sell chucks to go with it too.

8" base adapter plate mount chucks on rotary table or milling machine | CME Tools

8" base adapter plate is ideal to use on 8" rotary tables of either 3 or 4 slots to mount either 6" 3-jaw ,6-jaw or 4-jaw self-centering lathe chucks. This base adapter plate can also be used on milling, drilling machines if you remove the MT3 stub on the center of the plate. Morse taper 3 stub...

cme-tools.com

Here's another option.

The Adapter and 4 Jaw Chuck for Mounting on a 8

www.utoole.com

I can vouch for both vendors even though the second one's website looks iffy. I have purchased from both of them but was many years ago.