RE: [CAD_CAM_EDM_DRO] Cheap 56,000RPM milling upgrade (not a dremel :)

Woups. Just found the expensive link I was talking about.
This is the "rolls royce" solution, but costs about $500...

http://www.jlindustrial.com/catalog/product.jsp?origin=SEARCH%3AKEYWORD&id=A
TT-52720B

Or search on jlindustrial for "air spindle", they have a whole set of
different speed rated ones.
Hmm..not bad. Now I just need a compressor. :)

~Abby



-----Original Message-----
From: CAD_CAM_EDM_DRO@yahoogroups.com
[mailto:CAD_CAM_EDM_DRO@yahoogroups.com] On Behalf Of Abby Katt
Sent: 16 April 2005 15:44
To: CAD_CAM_EDM_DRO@yahoogroups.com
Subject: [CAD_CAM_EDM_DRO] Cheap 56,000RPM milling upgrade (not a dremel :)



Hi all,

I found this great link while looking around, for about $150 you can
basically get a air-powered mini die grinder and hold it in a collet on your
mill with a special hollow drawbar for the air intake. This way you get
56,000RPM milling for 2/16" (3MM) and smaller end-mills. But you'll need a
beefy compressor... You need 28CFM to run it 100% duty cycle, but I think if
you turned down the pressure you'd just get a little bit lower rate.

http://www.homemetalshopclub.org/news/feb04/feb04.html#mill

For those of you in the UK, I found one for < 100 pounds

http://www.cromwell.co.uk/KBE2702543K?popup=yes

Just Google or Froogle for "micro die grinder".
I remember finding something similar (but bigger) for about $500, which had
an air inlet on the side, and a centrally aligned stub which would fit into
a collet, but this mini-mod seems a lot better/economical for the hobby
CNCist. With a 3mm ballnose cutter you'd be able to cut at a rate of like
1.5M/mm! As it is anyway, I only tend to need the high speeds for small
cutters, this would be ideal for parallel finishing on engravings.

Not affiliated with any of these guys, just seemed a very good idea.
Especially since it's a lot more realistic than trying to make my own pulley
for my desktop mill to try and get 4000RPM out of bearings only rated to
2100.

(Don't forget to wear goggles or, best yet, have a cabinet around your CNC
if you start running your endmills at these high speeds. When they ping,
they automatically home towards your face/eyes/soft tissue.

~Abby







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
Unsubscribe: CAD_CAM_EDM_DRO-unsubscribe@yahoogroups.com
List owner: CAD_CAM_EDM_DRO-owner@yahoogroups.com, wanliker@...,
timg@...
Moderator: pentam@... indigo_red@... davemucha@...
[Moderators]
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........ bill List
Mom List Owner


Yahoo! Groups Links