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Messages - DICKEYBIRD

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1
General Mach Discussion / Problem with soft limits settings.
« on: January 29, 2021, 08:45:41 AM »
I am having trouble getting soft limits to work on my little Sherline conversion.

The machine homes to what I think are the correct locations ie: X trips the switch & backs off a bit with the table at the far left of its travel.  That is then X-zero with table movements toward the right going negative; max safe mechanical travel is -7.5".  Y trips & backs off at its farthest (away from the column) point.  Table movements toward the column are negative, max safe travel is -6.15".  Z zero is all the way up; traveling downwards is in the minus direction.

First, is this setup "normal' for a regular 3-axis column mill and second, would someone suggest a configuration for the Home & Limits page?  I think the "Home Off." setting is what is  giving me problems.

Thanks for any input.

2
General Mach Discussion / Re: Home/limits on same switch setup help.
« on: January 25, 2021, 01:24:46 PM »
Thanks TPS, it all works perfectly now. :)

3
General Mach Discussion / Re: Home/limits on same switch setup help.
« on: January 25, 2021, 10:19:17 AM »
Ouch! (Dope slapping myself) thanks! :-[

4
General Mach Discussion / Home/limits on same switch setup help.
« on: January 25, 2021, 07:29:02 AM »
Been away from things for a while and can't get this to work.  I have 3 single switches at the positive extents of XYZ travel and want to use them as both home & limits along with soft limits.

I should be able to start Mach3, press Reset, press "Ref all home" and each axis moves until it bounces off its switch, right?  I've missed something silly in the setup somewhere.  Can one of you Gurus take a look at my .xml please?

edit: Oh yeah, all switches are NC and wired in series.

5
General Mach Discussion / Re: Basic question about DM542T hookup to PP BOB
« on: December 24, 2020, 02:14:54 PM »
Thanks for your input fellows!  My BOB is an old straight through type from Winford Engineering with no opto isolation.  I think now's a good time to upgrade it. :)

6
General Mach Discussion / Basic question about DM542T hookup to PP BOB
« on: December 23, 2020, 09:40:50 PM »
It’s been a while & I’m rusty so be nice.

I’m installing the driver pictured below on my mill’s Z-axis and I’m confusing myself.  I have +5V from my PSU connected to the PUL+ & DIR+ terminals and Pin 6 & 7 from my BOB connected to the PUL- & DIR-. 

Question: Should I connect the 5V PSU’s common to the GND terminal next to the +V terminal or should it go the ground terminals on the BOB?  It’s just a simple PP BOB with no fanciness.

7
Show"N"Tell ( Your Machines) / Re: DIY Epoxy Frame based CNC MILL
« on: January 25, 2019, 02:21:16 PM »
If you like post a screenshot of your current design. Everyone faces this problem and it would be interesting to see different approaches.

Regards
John

I'm looking forward to seeing what you've come up with.  By the looks of your machine as it stands, I'm sure much cleverness & attention to detail has been invested in the Z-axis as well! 

I will clean up my crude 2D CAD sketch of my machine & post it here this weekend.  Thanks for the interest John & I greatly appreciate any tips (or criticism.)   

8
Show"N"Tell ( Your Machines) / Re: DIY Epoxy Frame based CNC MILL
« on: January 24, 2019, 02:55:58 PM »
Hello John; a marvelously well done machine you are building.  Thanks so much for sharing it with us! ;D

Would you please show a drawing of the Z-axis design?  I am building a fixed gantry mill as well and am not happy with any of the design iterations that have come to mind.

9
That looks really great Bill!  Your daughter is a very lucky girl. ;D

10
Good job Vince; nice having a CNC mill around to solve life's challenges, eh?  At least it wasn't yet another post on the web showing yet another 3D printer! ::)

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