Circular output in milling

[COMMAND JOHN]

Not bad but I can’t help with that control.

John

[richardfp4]

The Dialog has a direct measurement so
it cannot compensate for backlash and
it is not necessairy. This is a very precise
system usually and it will automatically
compenate for any backlash in the ballbearings
and ballbearing nut. That is because the
direct measurement is on the same location
of the spindle.

But if you have backlash in your X or Y guides
then you will have non precisie circles as
the direct measurement won't compensate
for that. You can adjust this with the tapered
keys that adjust the clearance in X and Y.

Be very carefully not to adjust it too tight as
this will cause even more problems. Just try to to tighten the tapered keys a little bit and see the effects, do it in very little steps and write down
the results. Let me know if you have any improvement. Mail me on rwagen@gmail.com
I have done this myself and have seen some
improvement on our Deckel FP4NC but this was not with circels.

[blmmdes]

That was useful information Ricard. Thank you. I will try your suggesion CAREFULLY and post the results in this forum.

[richardfp4]

The easiest thing to check is to up and
down the X for example 0.05 and -0.05 and measure if your total displacement is zero after this movement. If not, this is your backlash and
you can check the tapered keys which can
cause this.
You also have to do this for Y.
If you cut a circle you should cut very
few while finishing.
What machine do you have there?

Originally Posted by blmmdes That was useful information Ricard. Thank you. I will try your suggesion CAREFULLY and post the results in this forum.

[blmmdes]

i have a twin brother of yours. Deckel FP4A

finding out the amount of backlash is clear.

But

"If you cut a circle you should cut very few while finishing" what do you mean by that can you please explain.

[richardfp4]

Sorry for my bad english.

For example, cut only 0.1 mm and have
a feed of 0.03 mm/revolution/teeth if
you have a sharp mill. What I just mean
is to not cut for example 2 mm if this
is the last cut.

For our machine from 1984 the backlash
is only about 0.003 mm in both X and Y.
As you have a Dialog 11 which is much
newer it should be less.

Originally Posted by blmmdes i have a twin brother of yours. Deckel FP4A finding out the amount of backlash is clear. But "If you cut a circle you should cut very few while finishing" what do you mean by that can you please explain.