Re: [CAD_CAM_EDM_DRO] Router collets.

Hi Leslie;

thanks for the response. After doing a bit of online work, I've
discovered that extension arbors are available for ER series
collets. They come in many sizes thankfully some with 1/2" shafts.

My thinking is that such extensions would be ideal for operating small
diameter burrs, end mills and such with a standard router. They may
even eliminate some of the seating issues you bring up. For large
diameter bits it may do more harm than good as you would want to avoid
as much extension as possible.

Thanks
Dave


Leslie M. Watts wrote:

>Hi Dave
>
>Industrial routers often use standard collets like ER-25 etc.
>
>Their price puts them pretty much out of the hobby market though.
>
>I had problems running routers like Porter Cable on cnc machines
>related to their proprietary collets.
>
>With many cutters the shank pretty much has to float in
>the chuck...you often can't bottom them all the way to get
>a consistent tool height during changes. That meant using
>gages and such to slide them in a particular amount. It was
>a pain.
>
>So I developed a solution to this, as much of my work requires
>multiple tool changes in a program. I created a 1/2" shank set
>of tool holders that are bored out to 1/8, 1/4, 3/8, etc.
>Each holder has a different length stop machined in the body
>for the standard cutters I use. The cutters are then mounted
>with set screws in these holders such that the distance from
>the tool end to the machined stop is the same.
>
>So now when I change to a different cutter I simply put the
>holder in, push it home until the stop contacts the router
>collet face, and tighten. Every cutter is then the same height!
>If find this saves me a great deal of time.
>
>I am negotiating with some folks to sell these things and I am
>trying to get production quotes for making them economically.
>We are holding the inside bore to -0.0000 +0.0005 with 0.001
>or better concentricity to maintain balance and even
>cutting edge load. I make them from 1144 stressproof pre-hardened
>steel.
>
>There are some pictures of them on this link:
>http://www.lmwatts.com/forsale.html
>
>
>Les
>
>Leslie M.Watts
>L M Watts Furniture
>Tiger Georgia USA
>(706) 212-0242
>http://www.lmwatts.com
>Engineering page:
>http://www.lmwatts.com/shop.html
>CNC surplus for sale:
>http://www.lmwatts.com/forsale.html
>CNC carved signs:
>http://www.lmwatts.com/signwp.html
>
>
>
>
>-----Original Message-----
>From: David A. Frantz [mailto:wizard@...]
>Sent: Saturday, October 11, 2003 12:11 AM
>To: CAD_CAM_EDM_DRO@yahoogroups.com
>Subject: [CAD_CAM_EDM_DRO] Router collets.
>
>
>Hi Gang;
>
>
>All of this talk about Routers brings a question to my mind.
>
>Do any of the router manufactures us standard collets. That is ER or
>similar. The thought suddenly came to mind that if I build a CNC
>router / mill / whatever that ideally it should have a collet that
>accepts a wide range of tool sizes.
>
>So do Bosch, Porter Cable or any of the others use collets that are
>interchangeable with standardized hardware. It would be nice if one
>of these guys did.
>
>Thanks
>Dave
>
>
>
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