RE: [CAD_CAM_EDM_DRO] Improving accuracy on mini-mill? (lapping?)

Roger,

But I wasn't really thinking of using say.. 60 grit..

I was thinking more of using something fine (ie 600 to 1200 grit), to smooth
out the bearing surface and gibs, so that I could reduce friction, allowing
me to tighten them more and gain better rigitity. If I used a small enough
grit size, wouldn't it just remove the current irregyularities from the
surface and even it out more, so that they still more or less defined the
same plane, but moved with less friction?

I've heard of a few people using lapping.. Does anyone else have any
experience here?
A worthy-try, or a just plain bad idea?

Thanks!
Abby




-----Original Message-----
From: Roger Hampson [mailto:r_.hampson@...]
Sent: 22 March 2005 20:38
To: CAD_CAM_EDM_DRO@yahoogroups.com
Subject: RE: [CAD_CAM_EDM_DRO] Improving accuracy on mini-mill? (lapping?)



As far as I can see two things will happen.
1 the application of abrasive compound will size the machine slide ways

And

2 ruin what would otherwise be a usable machine

problem is that you have no method of lapping just the point you need to, to
bring back accuracy

Roger

-----Original Message-----
From: Abby Katt [mailto:cnc@...]
Sent: 22 March 2005 20:30
To: CAD_CAM_EDM_DRO@yahoogroups.com
Subject: [CAD_CAM_EDM_DRO] Improving accuracy on mini-mill? (lapping?)



Hmmm..

I noticed that if I stick a DTI of my asian mini-mill so it's probing offset
to the middle of the table table/vs the column and then press on the table
at the extents, I can see the DTI needle move quite a lot! Aaah! Now, since
the cutting head is usually in the middle of the table, I guess that the
effect here is not so much, but still...

So this makes me tighten up all the gibs, but the problem is that when I do
this, it makes it much harder to move the table (or impossible). This leads
me to ponder using some sort of lapping compound on the ways, and then
programming the mill to go back and forwards a few hundred times, to smooth
up the ways/gibmetal, so that I can then tighten the gibs more to get a more
rigid setup with less friction.

Is it a good idea?
What sort of lapping jive should I be using? Brasso? Valve grind compound?
1200grit? 600? Peanut butter and toast? :)

Is the lazy CNC way of having the mill do the work a good idea, or
bad-science? Will it just make more sense to do it all by hand with the old
emery-cloth?

Thanks guys!
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











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