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mach 3 froze
« on: March 20, 2013, 09:10:14 AM »
gentlemen; i was machining  a guitar in 2" blue styro foam  when mach froze, i had to close mach and reload and all was fine. i was past half way the code when it froze, i was doin' 120 ipm. this the second time this has happened. i built my machine, it's direct drive, 5 start,hobby cnc board and steppers, it's pulsing at a little over 27k, 1/8 micro step,i think my steps per is about 3200, i really can't get my steps per set right because it moves to fast to read the dial indicator revolutions. any way to slow it down? thank you for your help, richard stanley.

Offline Chaoticone

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Re: mach 3 froze
« Reply #1 on: March 20, 2013, 09:25:53 AM »
Richard, hit the tab key and the mpg fluout will appear.  Set your slow jog rate to what ever percentaenge you want.  Hit the tab key and the flyout will disappear again.

With all that being said, you should be able to do the math to come up the correct steps per.  Whats the lead on your screws?

http://www.machsupport.com/forum/index.php/topic,16315.0.html#new

Brett
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My guard dog is not what you need to worry about!
Re: mach 3 froze
« Reply #2 on: March 20, 2013, 10:07:19 AM »
thank you,  Chaoticone, the lead is .5 " per rev ,it seems like that would be a 2 pitch , also the spread sheet has a default  value of 10 in the micro stepping window, i am not familiar with that value. shouldn't it be something like 1/8 or 1/4? thank you very much richard .

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Re: mach 3 froze
« Reply #3 on: March 20, 2013, 10:28:50 AM »
.5 per rev lead on the screws=2,   X   200 (360/1.8 degree steppers)=400,  X   10 microsteps= 4000 steps per.  

.5" per rev on the screws seems awful high.  I would think they woould be .200" or maybe 5mm?

Brett



Edit Had to reword and add some to avoid confusion.
« Last Edit: March 20, 2013, 02:07:53 PM by Chaoticone »
;D If you could see the things I have in my head, you would be laughing too. ;D

My guard dog is not what you need to worry about!
Re: mach 3 froze
« Reply #4 on: March 20, 2013, 01:22:40 PM »
5 Start, .5" Lead = 10 pitch (.100")  correct ?

Russ
Re: mach 3 froze
« Reply #5 on: March 20, 2013, 01:44:11 PM »
Russ and Brett; i bought these off ebay the seller is IMSRV ,i think it stands for Imservice. i'm looking at the page i printed off ebay it says each revolution of screw moves .5 inch linearly.
accurate to.009 inch /foot.  it says 1/2-10, is that 10 pitch?  won't that be .100 x 5 =.5 ? by all means check em' out on ebay . i don't want em' to fool me. richard.
Re: mach 3 froze
« Reply #6 on: March 20, 2013, 01:47:50 PM »
.... it moves to fast to read the dial indicator revolutions. any way to slow it down?

Set your indicator up then command a move using MDI and control the feedrate with G1 F10.

Russ

You are right ... 1/2-10, 5 start is .5" per rev, 10 pitch
Re: mach 3 froze
« Reply #7 on: March 20, 2013, 01:57:03 PM »
so ... 2 turns per inch.
Lead = distance traversed by 1 revolution
Pitch = threads (peaks) per inch (Imperial), Metric is the actual dimension peak to peak
Steps per = Number of revolutions per unit (in your case 2) x motor resolution x micro stepping.

Offline Chaoticone

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Re: mach 3 froze
« Reply #8 on: March 20, 2013, 02:04:49 PM »
Yup, .5 lead it is.

Brett
;D If you could see the things I have in my head, you would be laughing too. ;D

My guard dog is not what you need to worry about!
Re: mach 3 froze
« Reply #9 on: March 20, 2013, 03:39:56 PM »
got  more confusion; 4000 steps has to right but now ,i tell it to move .5 " and it moves .622' does this mean i have change my micro steps to 1/4 or 1/2 i'm on 1/8.
sorry to put you old codgers through all this, richard.