Latest project

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Jose Rivera
Posts: 3803
Joined: Wed Feb 21, 2007 9:21 pm
Location: Vallejo California

Latest project

Post by Jose Rivera » Sun Jan 23, 2011 9:19 pm

Came up on a good deal on eBay buying a whole bunch of DA180 collets that I could not pass.
Now I had to either buy a holder or make my own.

So here are some pictures of what I came up with.
This is for a Maximat V10 P lathe without the threaded spindle.
Attachments
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There are no problems, only solutions.
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Retired journeyman machinist and 3D CAD mechanical designer - hobbyist - grandpa

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BadDog
Posts: 4730
Joined: Wed May 17, 2006 8:21 pm
Location: Phoenix, AZ

Re: Latest project

Post by BadDog » Mon Jan 24, 2011 2:04 am

Very nice looking job. However, have you looked into DA collet applications? They are generally designed and recommended only for drilling, and tool/work holding is generally discouraged. I couldn't find the web site I remembered that described all the collets and their strengths/weaknesses, but here is one that I turned up tonight. While it is an sales related site, it has much the same information I've seen elsewhere. Seems they don't have the large gripping range of ER or accuracy/grip of TG collets.

Like you, about 2 years ago, I found some high quality DA180 collets along with a few nice Kennametal 1" collet chucks very cheap. It's now in a project box intended for mounting on my lathe for boring bar duties. As with your application, not exactly recommended, but I think it will make a nice system for easily swapping/mounting my small boring bars, and maybe even for some limited drill mount duties. Looking forward to hearing how your project does over time. Good luck!
Russ
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Jose Rivera
Posts: 3803
Joined: Wed Feb 21, 2007 9:21 pm
Location: Vallejo California

Re: Latest project

Post by Jose Rivera » Mon Jan 24, 2011 9:34 am

Thanks for the heads-up BadDog.
I am no expert on collets, this was a spur-of-the-moment idea and fun to build.

Also justified having all those nice collets :lol: :lol:
There are no problems, only solutions.
--------------
Retired journeyman machinist and 3D CAD mechanical designer - hobbyist - grandpa

roundnose
Posts: 99
Joined: Thu Nov 11, 2010 4:21 pm

Re: Latest project

Post by roundnose » Mon Jan 24, 2011 6:42 pm

The DA collets have worked well for me in light milling applications.
Collets in general are not the best for heavy milling.
The ER style are probably better. Boeing made a switch to them several years ago, had good deals at the surplus store on DA collets and chucks, by the pound.
I adapted them for all kinds of applications on various machines.
They cant be much worse then 5C collets.
Back when Erickson was still Erickson, they had accuracy grades on the chucks, That is, more money bought a more accurate chuck.

Jose Rivera
Posts: 3803
Joined: Wed Feb 21, 2007 9:21 pm
Location: Vallejo California

Re: Latest project

Post by Jose Rivera » Mon Jan 24, 2011 6:48 pm

I am repeating .0015 in four inches. so for I what I am going to use them for they're good enough.
There are no problems, only solutions.
--------------
Retired journeyman machinist and 3D CAD mechanical designer - hobbyist - grandpa

roundnose
Posts: 99
Joined: Thu Nov 11, 2010 4:21 pm

Re: Latest project

Post by roundnose » Mon Jan 24, 2011 7:32 pm

Here are just some of my off the wall applications.

Holder on turret, Hardinge HC.
http://s170.photobucket.com/albums/u265 ... C00444.jpg

"Adjust true" collet chuck on Sioux valve grinder.
Laying on the valve grinder, an "adjust true" chuck rigged for Moore Jig Borer. Both of these were problem solvers.
http://s170.photobucket.com/albums/u265 ... rinder.jpg

Example of higher accuracy Erickson chuck in the tail-stock of a lathe. these were for a small Hauser Jig Borer, morse #2 shank.
http://s170.photobucket.com/albums/u265 ... ttools.jpg

Ha Ha, one adapted to a Unimat!
http://s170.photobucket.com/albums/u265 ... unimat.jpg

Various Erickson chucks.
http://s170.photobucket.com/albums/u265 ... cks001.jpg

These things have worked out well in my 'bing bang applications", my good die grinders use them.

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