开云体育

John,
I did my mill/drill for less than $200 for all THREE axis and that included
a used computer/monitor!!!

The biggest cost will be the encoders; however if you can find an old
deskjet printer, you can get a 360 lPI strip and encoder. Realize this will
be a max of about 10" long; but that will be good for the Y and Z axis.
This would leave you having to get only the X axis encoder at a higher price.

360 LPI in quadrature will give you 1/ (360*4) or a resolution of 0.00069"
See my tag line for info on how I did it.

At 05:15 PM 10/30/02 -0800, you wrote:

I'm trying to convert my mill/drill to DRO on the cheap (being a college
kid and not having much cash to spare), and right now I've got the option
of doing it with 0.0004" resolution on all three axis for $350 or 0.0004"
on X and Y and 0.0007" on the Z for $300. Is the higher resolution on the
Z axis really critical for general machining? I'm new to machining, so I
thought I would ask everyone on the list for input and thoughts.

John

Bubba

OLDER THAN DIRT
Country Bubba
(Actually the inventor of Country and Bubba)

axtein@...
LaGrange, GA

I'm trying to convert my mill/drill to DRO on the cheap (being a college kid and not having much cash to spare), and right now I've got the option of doing it with 0.0004" resolution on all three axis for $350 or 0.0004" on X and Y and 0.0007" on the Z for $300. Is the higher resolution on the Z axis really critical for general machining? I'm new to machining, so I thought I would ask everyone on the list for input and thoughts.

John

Bubba:
The reason for the cost increase is the linear strips instead of rotary, my
father and I are working on this together and he doesnt like the idea of
using a wire than can slip or stretch when linear scales are available for a
little extra. Since I use my mill/drill for building match-grade rifles,
slippage like could happen with a wire could cause massive problems if a
hole is .001" in the wrong place, X/Y location is critical in most stuff I
do, but depth isnt as critical as most critical parts are through-holes
instead of plunge cuts.

John

Hey, No problem. I was trying to offer assistance. BUT, I can understand
fully what you are saying.

At this point in time, other than stupidly on my part; I have had no
problem with slippage etc.

However you go, I wish you luck.
At 10:43 PM 10/30/02 -0800, you wrote:

Bubba:
The reason for the cost increase is the linear strips instead of rotary, my
father and I are working on this together and he doesnt like the idea of
using a wire than can slip or stretch when linear scales are available for a
little extra. Since I use my mill/drill for building match-grade rifles,
slippage like could happen with a wire could cause massive problems if a
hole is .001" in the wrong place, X/Y location is critical in most stuff I
do, but depth isnt as critical as most critical parts are through-holes
instead of plunge cuts.

John

Bubba

OLDER THAN DIRT
Country Bubba
(Actually the inventor of Country and Bubba)

axtein@...
LaGrange, GA