Pressbrake CNC Control Setup Questions

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06 Apr 2021 15:37 #205131 by andypugh

Yes, I will need machine on/off


How would you like it to work? You get to decide :-)

As far as homing goes, now yet I was manuel homing with ram cylinder at top of stroke. Should I be adding a homing switch or is it possible to home off of encoder index?

All things are possible, though if the machine automatically runs to top of travel when off, or always gets parked there, then there might be no need.

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06 Apr 2021 15:44 #205134 by andypugh
Which encoder do you have? One with distance coding or single index in mid-travel?
Is it an index pulse, or high for half the scale and low for the other half?

Basically homing would need to be added to the press component, as an extra few states in the state machine.

Do you actually have a backstop? Does that also need homing?

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06 Apr 2021 15:48 #205135 by EW_CNC
Also, thanks for adding the backstop!
I was not working on that part of the connection yet.

As an extra twist, the backstop is two axis. One axis for bend length and one axis for raising the stop up and down.
Both axis have homing switches.

Is it an industry standard to have Y axis for the ram, X axis for the bend length, and R axis for raising and lowering the backstop?

Attachments:

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06 Apr 2021 15:58 #205137 by andypugh

Is it an industry standard to have Y axis for the ram, X axis for the bend length, and R axis for raising and lowering the backstop?


It doesn't really matter, as this config makes no use of G-code. But we can change the pin names if you want.

Would it be usual to lower "R" then adjust X1, X2, Z1 and Z2? I can see we need more table columns.

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06 Apr 2021 16:51 #205145 by EW_CNC

andypugh wrote:How would you like it to work? You get to decide


I'll need a machine on/off button. I'm used to the axis gui. Do I need the estop button?
I have a physical estop button right at the controls.

Which encoder do you have? One with distance coding or single index in mid-travel?
Is it an index pulse, or high for half the scale and low for the other half?


I attached encoder pdf in previous post.
The encoder counts down (negative) as the ram moves down.
I believe it has single index in mid travel.

Would it be usual to lower "R" then adjust X1, X2, Z1 and Z2? I can see we need more table columns.


My pressbrake does not have the Z axis, only a single X and R

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06 Apr 2021 18:16 - 06 Apr 2021 18:17 #205163 by andypugh

andypugh wrote:How would you like it to work? You get to decide


I'll need a machine on/off button. I'm used to the axis gui. Do I need the estop button?
I have a physical estop button right at the controls.


It's up to you. How about drawing a mockup of what you think that the UI should look like?

Which encoder do you have? One with distance coding or single index in mid-travel?
Is it an index pulse, or high for half the scale and low for the other half?


I attached encoder pdf in previous post.[/quote]

Yes, the PDF describes two different styles of index.

The encoder counts down (negative) as the ram moves down.

Do you want it to? It's simple to change the scale factor of the hm2 encoder.

I believe it has single index in mid travel.

Slightly tricky, possibly. How can the system tell which way to go to find the index? (if it's a half-on / half-off track then it is easy)

Would it be usual to lower "R" then adjust X1, X2, Z1 and Z2? I can see we need more table columns.

My pressbrake does not have the Z axis, only a single X and R


Is R just up/down, or variable?
Last edit: 06 Apr 2021 18:17 by andypugh.

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06 Apr 2021 18:27 #205166 by Clive S
I am watching this with interest as I have the friends that is building one.

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06 Apr 2021 20:03 #205174 by tommylight

I am watching this with interest as I have the friends that is building one.

No pictures = never happened ! :)

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06 Apr 2021 20:54 #205186 by Clive S

I am watching this with interest as I have the friends that is building one.

No pictures = never happened ! :)


Tom are you doubting me. :ohmy:
This is an old pic.

photos.app.goo.gl/SPRQ9TTxBL8thX6e8

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06 Apr 2021 22:02 #205195 by tommylight
Yes i am, and i have seen that pic before (i think).
So i still insist it never happened! :)

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