Reply with Quote" This is a very low budget machine "
There is no real fix, backlash is mandatory and necessary.
It is the gap between drive screw and the stationary nut accuracy.
Brand new manual machines include backlash
Bolts and nuts have "clearance"
Understanding Backlash tests and fix options
I recently made my machine and am a complete novice. It is a home built steel frame CNC router with a working area of 600 x 400. Using Win10, UGS and GRBL on Arduino.
Up to now I have been ok with its accuracy as I have just been doing some v-carving for myself and not much else.
However I recently fitted a laser to my CNC router and could visibly see what I think is backlash. As shown in the picture below especially on X Axis
So I did some tests. Not having a dial meter I rigged up my digital calipers to record my findings. (Not great but it will do for now)
Ignoring the fact that I've still got some work to do on my measurements these where the results I got -
The process I used was to clamp the jig to table and the caliper to the end of the spindle set the calipers Zero and
Then I moved the gantry 10mm and then returned to zero. These where my results.
Command Result on Calipers Y10 9.24mm Y0 0.11mm Reset Calipers to Zero Y10 9.13mm Y0 0.00mm X10 9.99mm X0 0.96mm X10 10.01mm X0 0.99mm X10 10.00mm X0 1.00mm Reset Calipers to Zero X10 9.10mm X0 0.11mm X10 9.10mm X20 19.23mm X0 0.17mm
So it looks like Y Axis has 0.11mm backlash and X has 0.99 - Is that right?
Second question - How can I reduce the backlash specifically on the X Axis?
Here are 2 pictures of the belt setup I am using -
(This is a very low budget machine)
I use UGS and GRBL - There are no backlash settings in these that I am aware of.
Is there a free Windows 10 compatible GCode sender that includes a backlash setting?
My idea is once I can get better accuracy I will do the time honored thing of getting my machine to cut the parts for its replacement!
Sorry for the lengthy post and thanks in advance for any helpful suggestions.
Similar Threads:
Re: Understanding Backlash tests and fix options
" This is a very low budget machine "
There is no real fix, backlash is mandatory and necessary.
It is the gap between drive screw and the stationary nut accuracy.
Brand new manual machines include backlash
Bolts and nuts have "clearance"
Been doing this too long
Re: Understanding Backlash tests and fix options
Hi,
some CNC solutions like Mach have a 'backlash setting' but there is NO real software solution to backlash.
Preloaded ballscrews have zero backlash and that is what makes them so popular with CNCers.
Craig
