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Member postings for David Armstrong

Here is a list of all the postings David Armstrong has made in our forums. Click on a thread name to jump to the thread.

Thread: c.n.c .
05/10/2010 17:38:18
it does sound as John rightly suggests that it could be the z axis motor not being powerful enough for the job , give us details of the stepper motors used , and the machine you have converted , or even a photo will help , and no doubt we will be able to help further and solve your problem.
 
also does this 2mm multiply each time ? i.e it becomes additive to the measurment before , or is it consistant on each movement of only 2mm , if so this would indicate
more of a backlash or axis screw / nut movement
 
also give details of your power supply ? , it could be you are just not supplying enough voltage or current specificaly to the z axis motor , as this is usualy the most demanding axis , having to lift the weight of the head etc .
 
Dave
Thread: EN16T
24/09/2010 17:02:13
M-Machine stock EN16T , see there banner ad on this site
 
Thread: prototype to scale calculator
17/09/2010 11:05:59
James ,
could you also send a copy
 
 
Thread: Denford Senior 3C Z quill servo?
16/09/2009 09:33:42
Hi Dave ,
Well definatly sounds like a canidate for a rewind ! , i hazzard a guess that the motor is a Baldor , but as i know from experience ! , the usual fault with these is exactly what you suspected a winding fault probably shorted due to over heating , but i'd suspect more to do with age than anything else . you may pick one up off Ebay or go for a rewind if you'd still like to keep it running on servo's . 
 
you should be able to find a suitable motor as a replacement resonabely easy
by the size i'd recon it's about 6 - 9 Nm 
 changing to steppers is feasable , but more work involved as you say changing the analog driver board , you can still get analog input driver boards to stepper but few and far between and probably over budget !
 
if it were mine i'd go with getting the motor serviced , ok expensive but probably never needed to be done again in your lifetime ! , or pick up a comparable motor on ebay the last ones i got cost me £65
 
Dave 
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