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Author Topic: Constant Surface Speed.  (Read 7221 times)

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Re: Constant Surface Speed.
« Reply #10 on: March 02, 2009, 05:34:20 PM »
Mine is vast also........but nearly empty.

Offline Hood

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Re: Constant Surface Speed.
« Reply #11 on: March 02, 2009, 05:44:18 PM »
Yep I believe you ;)
Hood

Offline jimpinder

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Re: Constant Surface Speed.
« Reply #12 on: March 03, 2009, 04:07:15 AM »
Hood - Sorry, I was out all day yesterday.

The CSS worked very well, and it seemed to me, very smoothly. The wheels are 6 inches in diameter and I was cutting into the back by about 0.25 to lighten them - they are 1 inch thick. I wanted to start at the centre about 0.5 from the axle hole, and come out to a point about 1 inch from the rim.

I wrote the script that angled into the work, then ran parrallel to the  finish.  Botched the first one a bit (actually I needed a new tip on the tool) but after that it was a matter of mounting the hweel and pressing cycle start. I did all eight wheels in no time.

I can't really comment, I suppose, becasue the speed is constantly changing as the cut moves, but it seemed alright, and gave a nice finish.

As you know, I don't have a Bob, my index (single pulse) is optical reflector, straight to the computer.
Not me driving the engine - I'm better looking.

Offline Hood

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Re: Constant Surface Speed.
« Reply #13 on: March 03, 2009, 05:46:40 AM »
Thanks Jim,
 The speed will jump around even when I dont move the axis.
 Its definitely nothing to do with BOB or index or whatever else as it works fine when in normal RPM mode, smooth as silk, doesnt even fluctuate 0.5 rpm, if I tell it to do 2000 rpm it does, tell it to do 2rpm it does, 1562rpm and it does. Issue must be the way Greg has the  CSS with the SmoothStepper but as always I am confident he will fix it up, just like all the rest of the problems he has in the past :)
Hood

Offline jaja

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Re: Constant Surface Speed.
« Reply #14 on: September 22, 2010, 12:14:50 PM »
Hi Jim,

its all in there just waiting for you to tell it when to move.

Try this code :-

Zero out at some point in fresh air.

G21 (Metric)
G40 (Clear offsets)
G95 (Set feed per rev)
G00 X50. Z0 (Move to start point)
G96 S75 M3 (CSS 75 Metres/min)
G01 X10. F.1 (Feed at .1/rev)
G00 X50. Z1. (Rapid clear)
M30 (End)

Graham.


It is an old post,,,, but it helped me very much.
Could not get any further,, I always got the maximum spindle speed,, until I read your message to zero out in fresh air.
Now I can use Constant Surface Speed. Great.

Thank you very much for this part of code.  :D

gr jaja