C3 command changes

[gc3]

just installed 4g upgrade. is there a way to change the jog speed in the c3 file or do i have to make another file for the xy zeroing

[srwtlc]

Gene,

If you open "C:\SbParts\XYzero.sbp" or if you have an ATC, "C:\SbParts\Custom\ATC\ATC_XYZ_Home.sbp" and scroll down to the subroutine of "GetInchSpeedLimits:", you can change the speeds there (or if running metric, GetMetricSpeedLimits).

[gc3]

ATC...not quite, maybe one day

i opened that file but am lost with the "language" looks to be a percentage of the jog speed but i am unsure how to change it so the file will run

[srwtlc]

Scroll down to about line 194 and look for this section....

GetInchSpeedLimits:
&TopApproachSpeed = 1.0 Change this for the second pass move speed
&TopJogSpeed = 3.5 Change this for the first pass jog speed
&move_off_switch = 1
&big_move = -200
&small_move = -10

[bleeth]

Gene:
Scroll all the way to the bottom. The speed limits are in plain language.
I think the default jog speed is probably 3.5. This is in IPS.
the line reads &TopJogSpeed = 3.5 (or whatever.) Just change the number to whatever you want.

Simultaneous with Scott!

[gc3]

thank you both...i guess being able to jog the vintage PR around at 15ips kinda got me a bit confused...didn't even think to scroll through the whole routine.....

[bleeth]

A PR running at 15ips? That would make a heck of a video!!

[ironsides]

What is 4G upgrade?

George

[gc3]

What is 4G upgrade?

George
http://www.becausewecan.org/node/266

[zeykr]

Gene,
What do you think of your 4G now that you've had it on the PR a few days?

[gc3]

Gene,
What do you think of your 4G now that you've had it on the PR a few days?

http://www.youtube.com/watch?feature=player_detailpage&v=mAcdZfl_-Y0

not the best quality video but you can get the idea...

Ken...WOW what a difference!!! i have yet to cut anything but it's easy to tell it will make a huge difference!

[br928]

Gene,

Are those gearbox motors or direct drive?

[gc3]

pk296a1a-sg3.6 6 wire motor....i plan on connecting halfcoil to try and get a little more speed i do more carvings than sheetgoods work...

below is from search on this forum-----


If those motors have all six wires, you're in luck because you can wire the motors half-coil. The 4G option can be used, even if you wire the motors half-coil.

Here's the difference. Many of the motors supplied by Shopbot only had four wires, Black, Green, Red, and Blue. The Black wire and the Green wire internally are connected to the motor's 'A' coil. The Red wire and the Blue wire are internally connected to the motor's 'B' coil. Your motors have two extra wires, a Yellow wire and a White wire. The Yellow wire is the center tap for the 'A' coil and the White wire is the center tap of the 'B' coil.

If you wire the motors using the Black wire and the Yellow wire for the 'A' coil, you will have wired the 'A' coil using only half of the coil and that's why it is called half-coil. You do the same for the 'B' coil by using the Red wire and the White wire.

Many people think that if you wire a motor and only use half of a coil that you only get half of the motor's torque. That is not correct; you get 70% of the motor's torque. Sometimes that is a concern. With the PK296A1A-SGxx motors, that has no effect. The gearboxes attached to those motors cannot handle all of the torque that those motors can produce, so wiring the motors half-coil does not reduce the available torque.

What you do get is the possibility of higher speed. The Oriental Motor torque charts show that when wired bipolar-series, a PK296-01AA motor (electrically equivalent to the PK296A1A-SGxx motor) is good for about 150 RPM before torque takes a complete nose-dive. That same motor when wired half-coil has the same amount of torque at 750 RPM.

Depending on what size spur gear you use, 150 RPM is about 2.7" per second while 750 RPM is about 13.6" per second. Now, don't get all excited and think that you'll be able to cut at 13.6" per second before loosing steps. There are too many other mechanical factors involved, but anticipating speeds of 5" per second is not unreasonable. Even with my PRT-Alpha and 7.2:1 Alpha motors, I rarely cut faster than 5-ips when cutting cabinet parts. That is the speed that gives me the best quality with the least amount of edge sanding. Taking a little more time on the Shopbot can make a huge difference in the total time to fabricate a part.

[zeykr]

Stan,
They are gearbox motors assuming he hasn't changed them out recently.

Gene,
I remember when I upgraded the PRT to the 4g. Made a heck of a difference. I also really liked that it was now difficult to blow a drive where on the 3G it'd happened to me a couple times.

[br928]

Looks like they are 3.6/1 spur gear motors.

When I first install my 4G (BotRod) I was able to get 14"/sec jog rates but that was on the edge of reliability. I have since backed it down to 10"/sec and just left it there. Still plenty fast for me.

Blowing driver chips was the main advantage for upgrading to 4G. 3-4 times the speed is nice too.