I got my Quill DRO installed today and am having a repeatability
problem. Sometimes the scale will stop at -.003" instead of zeroing
out. The repeatability of the scale is said to be .01mm or .0004
inches. I find that hard to believe and figured .001" at best as this
is an import unit. This may me more of a quill problem than the scale.
All in all it is a nice unit for $75. Any suggestion are greatly
appreciated on the repeatability issue. Thanks, Steve

On 18 Jun 2005 15:01:01 -0700, wrote:

I got my Quill DRO installed today and am having a repeatability
problem. Sometimes the scale will stop at -.003" instead of zeroing
out. The repeatability of the scale is said to be .01mm or .0004
inches. I find that hard to believe and figured .001" at best as this
is an import unit. This may me more of a quill problem than the scale.
All in all it is a nice unit for $75. Any suggestion are greatly
appreciated on the repeatability issue. Thanks, Steve




If you're suspecting quill problems, rule those out first. Place a dial or
test indicator under the quill. Zero it at the stop. Test. It should
repeat the zero reading every time. If you still have a +/-.003" variance,
figure out why your stop in not repeating.

If the above method repeats, then your problem is with the DRO/reader.
Check ALL the fastener are tight.
--
Skuke
Reverse the domain name to send email

Also you might try to keep pressure on the quill, say, with it stopped
against the table. Zero it. It should be "repeatable" at the same place
with the same amount of pressure on the handle.

Bob Swinney

"skuke" wrote in message
...
On 18 Jun 2005 15:01:01 -0700, wrote:

I got my Quill DRO installed today and am having a repeatability
problem. Sometimes the scale will stop at -.003" instead of zeroing
out. The repeatability of the scale is said to be .01mm or .0004
inches. I find that hard to believe and figured .001" at best as this
is an import unit. This may me more of a quill problem than the scale.
All in all it is a nice unit for $75. Any suggestion are greatly
appreciated on the repeatability issue. Thanks, Steve




If you're suspecting quill problems, rule those out first. Place a dial
or
test indicator under the quill. Zero it at the stop. Test. It should
repeat the zero reading every time. If you still have a +/-.003"
variance,
figure out why your stop in not repeating.

If the above method repeats, then your problem is with the DRO/reader.
Check ALL the fastener are tight.
--
Skuke
Reverse the domain name to send email

I would like to know how your doing your test? What is your setup for the
stop and how are you determining that you are at the stop? In my minds eye
I would see you doing this with a DTI chucked in the spindle and indicating
on a fixed point, like the top of the fixed vise jaw or t he table. If you
bring the quill down to the same DTI reading does the DRO read the same?
Now overshoot the mark and approach it from the opposite direction, do you
still get consistent readings? Doing this should eliminate any flexure in
the machine and give you a better idea of what the DRO is doing. I've said
this assuming that you have been moving the quill to a hard stop by feel and
adding in some machine flexure and springback to the process.
lg
no neat sig line
wrote in message
ups.com...
I got my Quill DRO installed today and am having a repeatability
problem. Sometimes the scale will stop at -.003" instead of zeroing
out. The repeatability of the scale is said to be .01mm or .0004
inches. I find that hard to believe and figured .001" at best as this
is an import unit. This may me more of a quill problem than the scale.
All in all it is a nice unit for $75. Any suggestion are greatly
appreciated on the repeatability issue. Thanks, Steve