Re: [CAD_CAM_EDM_DRO] Re: Machining both ends (depth stop)?

Sure there are lathes that use collets. Of course their spindle must accept them. For precision and unmatched concentric repeatability, collets are the way to go in a lathe. The next best thing is a 4-jaw chuck that is dialed in for each individual workpiece. 3-jaw chucks are the worst. Their mechanism in their center hole being open and centrifugal force loading chips in the scroll they are not at all dependable for concentricity. They are the easiest and the fastest but, least accurate.

I have to be honest when I suggested a rod stop through the collet I thought we were talking about an E5 type of collet. Which uses a hollow draw bar. I went and looked at them and that would not work.

Here is how I adddressed the issue of stops for blind hole workholding fixtures in the past. I made a stop that swings away and bushed for accuracy. It mounts to the table, has a pivoting arm with stop-rod that swings over the part. Place the part in the fixture and pull it out to the stop and secure it. Then simply swing the stop out of the way and machine the workpiece. They also work well for long bars in a production operation that will be profile milled on both ends. Bring the bar up to the stop, pivot it away to allow clearance for the cutter.

Ron

"David A. Frantz" <wizard@...> wrote:

Just wait a bit, one of the Chinese lathe builders has a lathe with such
a spindle. I do not know of anybody importing it yet but if you cruise
around some of the Chinese tool manufactures web sites you will find it.

For a modern shop I actually think that this would be a nice lathe to
have. I'm rather surprised it is not being imported yet. Probally
costs to much relative to the perception of Chinese tools.

Dave


metlmunchr wrote:

>Most collet chucks have a stop screw in them. Are you holding the
>part in the spindle and holding the tool stationary? Just trying to
>get some mental picture of what you're trying to achieve since I've
>never seen ER collets used in the spindle of a lather as a workholding
>collet.
>
>--- In CAD_CAM_EDM_DRO@yahoogroups.com, R Rogers wrote:
>
>
>>If its a lathe, you set a stop inside the spindle. Long rod that
>>
>>
>goes all the way through it.
>
>
>>Ken Gracey wrote:
>>
>>Hey there,
>>
>>The solution must be so simple I can't see it, so I'm interested in
>>how the group steers me on this question.
>>
>>I'm machining a part with two ends. Both ends need to be machined. I
>>will hold the part in ER25 collet, machine one side and flip it
>>around. How do I know the depth in the collet when I've flipped it
>>around?
>>
>>Is there a trick or another tool to help me out? I'd like to be able
>>to make multiple units efficiently.
>>
>>Thanks,
>>
>>Ken
>>
>>
>>
>>
>>
>>Addresses:
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Addresses:
FAQ: http://www.ktmarketing.com/faq.html
FILES: http://groups.yahoo.com/group/CAD_CAM_EDM_DRO/files/
Post Messages: CAD_CAM_EDM_DRO@yahoogroups.com

Subscribe: CAD_CAM_EDM_DRO-subscribe@yahoogroups.com
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URL to this group: http://groups.yahoo.com/group/CAD_CAM_EDM_DRO

OFF Topic POSTS: General Machining
If you wish to post on unlimited OT subjects goto: aol://5863:126/rec.crafts.metalworking or go thru Google.com to reach it if you have trouble.
http://www.metalworking.com/news_servers.html

http://groups.yahoo.com/group/jobshophomeshop I consider this to be a sister site to the CCED group, as many of the same members are there, for OT subjects, that are not allowed on the CCED list.

NOTICE: ALL POSTINGS TO THIS GROUP BECOME PUBLIC DOMAIN BY POSTING THEM. DON'T POST IF YOU CAN NOT ACCEPT THIS.....NO EXCEPTIONS........
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