Hey guys,
So like in my last post i eventually got the calibration to go through by having the power cable face one of the short sides of my 6’x10’ frame.
It kept failing when i had the cable facing long way
6’x10’ frame is a mistake as the angle is to extreme that motors are hitting the Z bearing tower holders.
I am trying to get around this with 3" edge exclusion
So i did a cut with a 3/4" (.70") board of plywood doing a side of a cabinet that has dimensions of 79.85" x 19.075"
1/4" endmill single flute
20"/min
Dewalt on speed 1 to try to get better chip
Less than 3mm cut per pas i think actual was around .101"
Final cut was 79 7/16" x 19 3/16" Cut looks relatively square using small square
I will go back and double check with a larger square
The 79" dimension is orientated on the X
And the 19" dimension is orientated on the Y
So with this my Y cut is long by about +.1125 or almost 1/8"
The X cut is short by about -.4125 or above 3/8" that is a lot
I could allow 1/32 in my design or up to 1/16"
Y error is about +.59% of cut length
X error is about -.52% of cut length
Interesting enough the percentages are similar but obviously one is long and one is short
What is the best accuracy that people were getting in a cut
And was it able to hold that precision at that accuracy over time
Looking at various topics about accuracy there are obviously huge amounts of variables that drive this machine
Trigonometry of force on the belts as angles change and how that effects the force balance on the X/Y axis
Belt stretch
Encoder error
Rounding error
Calibration error
Angle of belts in the Z axis
Frame flex
Maslow machine flex/rigidity
Flatness of the frame
Flatness of the board the machine is cutting and riding on
Even Z axis of levels that the belts are mounted at
Thermal expansion
Imperfection in belt tooth mfg effecting encoder pickup
Chips and other intrusion into moving parts
ETC
What have you guys done to increase your accuracy and what have you gotten to on cut
I have had good accuracy on a 2’ x 2’ cut tolerances within the thousands or right on
Thanks
Steven Mosbrucker wrote:
So like in my last post i eventually got the calibration to go through by having the power cable face one of the short sides of my 6’x10’ frame.
It kept failing when i had the cable facing long way
6’x10’ frame is a mistake as the angle is to extreme that motors are hitting the Z bearing tower holders.
I am trying to get around this with 3" edge exclusion
check with the frame calculator http://lang.hm/maslow/maslow4_frame.html and
find what working area you can support with your frame size and make sure you do
your calibration well within this area (cutting outside that area is ok for a
bit, but for calibration you want to avoid going out of the best area)
David Lang