Someone told me perhaps the heat was affecting the grease in the sliding / screw mechanisms - changing its consistency - and causing a momentary stall, hence mother board losing itself??
My instinct is it doesnt get that hot but I'm a woodworker, not a metal engineer!!
You mention that the spindle collet get hot and clamps get warm. Have you tried running the machine without the spindle running (doing fresh air cuts) and then see if the machine loses position?.
You really need to give more info and a clear description of the problem you are having. ..Clive
As it happens I did do a fresh air cut with the same outcome.
The first time when doing a proper cut it aborted but didn't dive into the work. Feed rate was running at 'half' speed.
Second time - the air cut - I ran at full speed (not sure why!); it did the same "Machine error - machine requested to move to x=123...blah" and aborted but this time also dived into the work before coming to a stop.
Is that any help?
Did you run it with the spindle off? When you did the air cut you said it dived into the work piece how much higher than the work was it? Did the spindle get hot? Do you hear any abnormal noise? ..Clive
Tom sounds like you have a few issues going on here. I can help but it will mean you trying one thing at a time giving clear replys to my questions and not going off at tangents.
Has this machine ever worked correctly while in you owned it. Or have you bought it like this.?
Can you run the spindle without CNC side being turned ON so we can identify if the spindle is getting hot and transfering heat to machine.
I don't see any speed controller inside the Control box you showed so I'm presuming the spindle has manual speed control or fixed speed.! Which is it.?
OR is there another board or electronics your not showing.?
Need you to CUT air WITHOUT the spindle running and at the normal feedrate. But I want you to NOT turn on power to the machine until last minute. Then quickly load program and start cutting air.
Take a note of the Stepper temps and check at intervals while cutting air to see if they get hot. And how long before they do. It's not unusual for steppers to get hot while stood at rest so this is why I need you to start from cold and check temps.
While cutting they should be just above warm to mildly hot, and when at stand still for ten to fifteen minutes be like holding a cup of tea or coffee after minute or so off boil.!! . . They shouldn't burn.
Try this and let me know.!
Last edited by JAZZCNC; 28-05-2015 at 10:42 PM.
thank you for your reply.
I think this is the only other pic I have so including the previous - thats the guts of it.
Pretty sure its fixed speed spindle.
I will do the actions you describe today.
Assuming normal feed rate is the optimum one for the cutter and material (3.2mm dia bullnose, oak) therefore full feed rate??
For the record - Machine history:
Bought machine with video knowledge of axes moving manually and spindle turning on and off.
Having received it, on switching the power to the machine and pressing the homing button it lifted in the z axis, got to its limit, made a horrible noise (groaning) and didnt home.
On advice from Boxford I 'flashed' the [electronics] with the relevant program and that cured its homing issue. I still have to do this from time to time but have a suspicion the z axis proximity switch may be faulty.
From there I tried a few cuts at full feed rate and each time the machine aborted half way through having 'over-travelled'. What is slightly odd is that it looked as though the machine had lost its memory for a minute, dived into the work, come out again and carried on as it should..and then come to a premature stop!! Boxford were adamant this was impossible!
Since then I have made 8 successful pieces (landscape relief work) each taking about 6 hours - MACHINE RUNNING AT HALF FEED RATE (again on advice from Boxford)
Spindle collet always got very hot at full feed speed, less so at half feed speed (which allowed me to cut those 8 pieces). Now getting hot which ever feed rate.
2 days ago.... tried a cut at half speed. Did the first tool change and then it aborted half way through that finishing stage. Spindle collet and housing hot.
then...... after letting everything cool, (still on half speed) started from that same tool and let it follow the already cut second stage - ie cutting air until reaching where it left off - but it aborted before it got there. Spindle hot.
Yesterday, ran same program with spindle off and no material in place. It finished the job. Noticed how the x axis stepper motor got too hot to touch.
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