Jim,
End mills or slot drills would certainly be ideal,but if that's not
immediately possible the next best results would be with the
shortest-fluted drills you have. Also drilling with no more than a
single panel stack and with minimum penetration of the drill depth
into the backer (good for all kinds of drilling) will achieve better
results.
Mike Mikucki
______________________________ Reply Separator _________________________________
Subject: Re: [TN] slot drill
Author: "Wilmer; Craig" <[log in to unmask]> at SMTPLink-Hadco
Date: 1/22/99 10:04 AM
Jim,
I used to experience the "jagged banana" slot problem also on smaller
diameter tools. My intertim solution was to write the slots into the
drill program as route sequences provided it was a primary drill
operation. This still left some deformity in the panel at the plunge and
retract points, but was much better than the CNC G85 command. To
minimize the bit deflection deformity, I programmed my plunge and
retract points in the center of the slot. I did reduce the feed rate and
decreased the panel stack height and this helped slightly, but adding
another tool change to the program and decreasing the stack height
wasn't very efficient. You might also check to make sure the pressure
foot on the spindle is clamping and releasing properly if you use a
route sequence. If slots are becoming a way of life with your customers,
I recommend installing a copy of FASTechnologies NC-CAM Drill/Route Edit
on your workstation and the problem will disappear, provided you have
the budget resources. They have the best optimization and slot drilling
algorithms bar none. Their S3 slot algorithm makes the G85 command look
like a tomahawk approach. When drilling slots even with this product, be
sure to slow the feed rate slightly (20-30 IPM)and set the max hit
counter on the tool to 1000-1500 (depending on diameter) hits in the
program header. This will keep them straight with excellent hole wall
characteristics for plating. Here's a link for the product...
http://www.fastec.com/drill/drill.htm
Regards,
Craig Wilmer
PCA Product Engineering
email:
mailto:[log in to unmask]
web:
http://www.ktecelec.com
http://www.kentelec.com
____________________
K*TEC Electronics
1111 Gillingham
Sugar Land, TX 77478
-----Original Message-----
From: Ken Brown [mailto:[log in to unmask]]
Sent: Thursday, January 21, 1999 7:24 AM
To: [log in to unmask]
Subject: [TN] slot drill
I AM HAVING A PROBLEM WITH DRILLING SLOTS. THE LARGER SIZE HOLES ARE NO
PROBLEM BUT ANYTHING UNDER .055 IS GIVING ME CROOKED OR JAGGED LOOKING
SLOTS. IN THE PAST WE ALWAYS EDITTED ARE DRILL FILES ADDING G85S', BUT
A GREAT DEAL OF OUR CUSTOMERS ARE ADDING SLOTS IN GREAT NUMBERS ALL OVER
THEIR BOARDS. AND ADDING G85S' BECOMES TIME CONSUMING AND LEAVES US OPEN
TO OPERATOR ERROR. I REALIZE THAT FEEDS AND SPEEDS ARE PART OF THE ISSUE
BUT I AM WONDERING UNDER THE SLOT DRILL CHOICE IN ROUT WHICH METHOD IS
THE BEST FOR CREATING SMALL HOLE SLOTS. IT SEEMS WHETHER WE CHOOSE
SEQUENTIAL, ALTERNATING, OR MIDPOINT WE ARE GETTING SOME DEFORMITY. IF
YOU HAVE ANY SUGGESTIONS IT WOULD BE GREATLY APPRECIATED.
THANK YOU,
JIM HENDERSON
COLONIAL CIRCUITS, INC.
540/752-5511
[log in to unmask]
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