Shopbot PRS 48x96 Acorn / Clearpath Conversion

All things related to the Centroid Acorn CNC Controller

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Sword
Posts: 651
Joined: Fri Nov 30, 2018 1:04 pm
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Location: Thorp WI

Re: Shopbot PRS 48x96 Acorn / Clearpath Conversion

Post by Sword »

Not so fast on a 4x8 machine. Accuracy between homing has been good. If it isn't, slow it down a bit and make sure your targets are adjusted with minimal clearance (close). Should have stated that the 250 is XY and the Z is 90. The second touch never gets to that feedrate.

Scott
Scott
martyscncgarage
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Re: Shopbot PRS 48x96 Acorn / Clearpath Conversion

Post by martyscncgarage »

Sword wrote: Mon Jan 11, 2021 12:32 pm Not so fast on a 4x8 machine. Accuracy between homing has been good. If it isn't, slow it down a bit and make sure your targets are adjusted with minimal clearance (close). Should have stated that the 250 is XY and the Z is 90. The second touch never gets to that feedrate.

Scott
Interesting, seems to me like its easier to stop a car moving at 20mph instead of 200...I would rather have the car crash into the wall (if it HAS to crash, at 20mph instead of 200. The carnage might be easier to fix :) )
The routers I have done, I have taught my clients to use the PARK feature when they shut down for the evening, OR manually jog the axis (fast jog) close to the home switches before pressing cycle start to home....

Marty
Reminder, for support please follow this post: viewtopic.php?f=20&t=383
We can't "SEE" what you see...
Mesa, AZ
Sword
Posts: 651
Joined: Fri Nov 30, 2018 1:04 pm
Acorn CNC Controller: Yes
Plasma CNC Controller: No
AcornSix CNC Controller: No
Allin1DC CNC Controller: No
Hickory CNC Controller: No
Oak CNC controller: No
CNC Control System Serial Number: none
DC3IOB: No
CNC12: Yes
CNC11: No
CPU10 or CPU7: No
Location: Thorp WI

Re: Shopbot PRS 48x96 Acorn / Clearpath Conversion

Post by Sword »

Scott
martyscncgarage
Posts: 9912
Joined: Tue Mar 28, 2017 12:01 pm
Acorn CNC Controller: Yes
Allin1DC CNC Controller: Yes
Oak CNC controller: No
CNC Control System Serial Number: none
DC3IOB: No
CNC12: Yes
CNC11: Yes
CPU10 or CPU7: Yes
Location: Mesa, AZ

Re: Shopbot PRS 48x96 Acorn / Clearpath Conversion

Post by martyscncgarage »

Sword wrote: Tue Jan 12, 2021 11:53 am No carnage. ;)

https://rumble.com/embed/va2z3f/?pub=8joj5
yet.....
Reminder, for support please follow this post: viewtopic.php?f=20&t=383
We can't "SEE" what you see...
Mesa, AZ
Sword
Posts: 651
Joined: Fri Nov 30, 2018 1:04 pm
Acorn CNC Controller: Yes
Plasma CNC Controller: No
AcornSix CNC Controller: No
Allin1DC CNC Controller: No
Hickory CNC Controller: No
Oak CNC controller: No
CNC Control System Serial Number: none
DC3IOB: No
CNC12: Yes
CNC11: No
CPU10 or CPU7: No
Location: Thorp WI

Re: Shopbot PRS 48x96 Acorn / Clearpath Conversion

Post by Sword »

It would be a nice addition though, if you could have a slower second seek option, much in the way you can have fast/slow probing settings.
Scott
paulwall
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Re: Shopbot PRS 48x96 Acorn / Clearpath Conversion

Post by paulwall »

The machine is up and running, and I did my first spoil board planing with great results over the weekend. I have a 0.5mm (0.02") out of mechanical square in my gantry which even after 3 adjustments of my gantry gussets I can't seem to land exactly dead nuts on square, I'm always over or under by about that, so I figure I'll pull the remaining 0.5mm out with my motors via the Y-slave home sensor.

Problem there is that the ShopBot's proximity sensor isn't setup for high accuracy twist adjustment of the NPN prox sensors, as the sensor points perpendicular to the y-travel direction. Meaning instead you move a bolt head on the frame away or closer by untightening, sliding, and resetting the bolt. This makes fine tuning by sub 0.5mm increments a real pain. I'm thinking of installing proximity mounting blocks which put the sensing direction collinear to the Y-travel direction, but am worried about crashing the sensors down barrel as they're only 8mm barrel diameter (2.5mm sense distance, 0.1") and the standard deadband on homing seems to be like 0.25 to 0.375".

Is there a way to adjust the standard homing dead-band distance outside of the wizard?

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