Bridgeport EzPath Lathe,Acorn Board & Handwheels

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bertman1
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Bridgeport EzPath Lathe,Acorn Board & Handwheels

Post by bertman1 » Mon Jan 08, 2018 7:19 pm

I need some help on installing the Acorn board on a Bridgeport EzPath Lathe, I understand that the Acorn board only has one encoder output on the board, I just realized reading on the forum about the hand wheels on the lathe that they have encoders on them also, also mention on the forum was that Centroid has an extension board for 395.00, will that extension board work or what do I need to do to get the encoders to work on the hand wheels is there a cable I need and this board or can they work on the Acorn board? :oops:

cnckeith
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Re: Bridgeport EzPath Lathe,Acorn Board & Handwheels

Post by cnckeith » Mon Jan 08, 2018 7:30 pm

currently there is no support for dual handwheels on a lathe with Acorn.
we are working on USB MPG compatibility drivers which might allow two MPG handwheels to be used.
for now, moving an axis manually with Acorn can be accomplished by the means outlined on this page.
http://www.centroidcnc.com/centroid_diy ... ntrol.html

the encoder expansion board mentioned is compatible with Oak and Allin1DC not Acorn.
Acorn will in the future allow MPG connections using the CNCPC's USB ports therefore eliminating the need for an expensive encoder expansion board.

The Allin1Dc has 6 encoder inputs and can accept dual MPG handwheels for a Lathe application. (no expansion board needed)
The Oak has two additional encoder inputs and you can use the spare axis (axis 3 and 4) encoder ports as MPG inputs (no expansion board needed with a lathe for dual handwheels.)

bertman1
Posts: 5
Joined: Tue Jan 02, 2018 9:16 pm
Acorn CNC Controller: Yes
Allin1DC CNC Controller: No
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MPU11 & GPIO4D -w/ 3rd Party Drives: No
DC3IOB: No
CNC11: No
CPU10 or CPU7: No
System Serial Number: none

Re: Bridgeport EzPath Lathe,Acorn Board & Handwheels

Post by bertman1 » Tue Jan 23, 2018 1:19 am

Thank for your help cnckeith. do you have any idea when the drivers for acorn board to use hxt mpg so i can use on the bridgeport lathe thanks. bertman1

tblough
Posts: 131
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Re: Bridgeport EzPath Lathe,Acorn Board & Handwheels

Post by tblough » Tue Jan 23, 2018 10:02 am

Just to expand a little to what Keith posted above about the Oak board. The Oak has two DB9 connectors for encoders - one is usually used for the spindle and the other is a spare. Additionally, any unused motor/axis input on the Oak can also be used for an encoder input by making a custom cable. Finally, the MPG input if unused can be used as an encoder input although it does not support an index input.

Using all of these encoder inputs you can build a 2-axis servo lathe with dual handwheels, dual glass scales, and a spindle encoder with the Oak.
Cheers,

Tom
Confidence is the feeling you have before you fully understand the situation.

bertman1
Posts: 5
Joined: Tue Jan 02, 2018 9:16 pm
Acorn CNC Controller: Yes
Allin1DC CNC Controller: No
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MPU11 & GPIO4D -w/ 3rd Party Drives: No
DC3IOB: No
CNC11: No
CPU10 or CPU7: No
System Serial Number: none

Re: Bridgeport EzPath Lathe,Acorn Board & Handwheels

Post by bertman1 » Wed Jan 24, 2018 3:46 pm

Tom thank you for your help. I have ordered 1 more oak from centroid so i am set the lathe two hand wheels and spindle encoder off the board and hope not to many problems. thanks tom cheers.

tblough
Posts: 131
Joined: Tue Mar 22, 2016 10:03 am
Acorn CNC Controller: No
Allin1DC CNC Controller: Yes
Oak CNC controller: Yes
MPU11 & GPIO4D -w/ 3rd Party Drives: Yes
DC3IOB: No
CNC11: Yes
CPU10 or CPU7: No
System Serial Number: 100505
100327
102696
Location: Boston, MA
Contact:

Re: Bridgeport EzPath Lathe,Acorn Board & Handwheels

Post by tblough » Wed Jan 24, 2018 5:57 pm

Bertman1,

This post has the connector part numbers you will need - Digikey stocks them:

viewtopic.php?f=20&t=883&p=4020&hilit=o ... eels#p4020

and I've attached the schematic for the cables. If your axis moves the wrong direction with the handwheel, you'll need to swap the A and B phases to invert the encoder. Centroid let's you put in a negative PPR value for the spindle to reverse the encoder direction, but you can't do that with the other encoders. The only way is to swap the phases.
Attachments
Handwheel Cables.pdf
(72.73 KiB) Downloaded 8 times
Cheers,

Tom
Confidence is the feeling you have before you fully understand the situation.

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