8x4 Build based on plans by Joescnc Hybrid R&P

[GrahamWhite]

So with the ball screw it needs space for the mounts top and bottom- so doesn't work with the Vee bearing rails :(
I went for SBR16 - supported rail bearings- would have liked square profile but the cost was too much.
This is the state of the Z axis at the moment -getting there :) waiting on the long bearings for the rails- will be going for MDF front plate at the minute and changing to aluminium later I hope :)
The clearance on the X axis bolts is tight but clear is clear :)


I will have to manually adjust the Vee bearings on the X but hopefully that's not too much of a pain(instead of cam adjusters).
I hope this is an upgrade to the Z and not a downgrade!!
The bottom of the X has approx. 7" clearance from the bed after I add a whole base board and then a spoil board on top- gives me a usable Z height of 7"!! providing it doesn't have too much play.
Steppers, drivers , psu's etc all ordered- gone with a UC300eth - 5lpt for the control box
Water cooled spindle has arrived ,wow its got some weight to it!

[GrahamWhite]

Ok so it's time to start looking at the control box- I have a large 700mmx500mmx 200 steel enclosure which I will have to wall mount as it wont fit under the router base!
How does someone with absolutely no knowledge of electrics design or layout the insides!??
I've had a search on the forum and to be honest it looks a tad daunting(this is the bit I wasn't looking forward to!)
A basic wiring diagram I can just about follow but throw in relays or anything else then I'm lost :(

[mekanik]

Hi Graham
Think there is a diagram in one of the build threads, Dean/Jazz posted it a while back. as he is watching you he will probably be able to help.
Regards
Mike

[JAZZCNC]

How does someone with absolutely no knowledge of electrics design or layout the insides!??

Ok simple rule of thumb with layout is to keep mains voltage items/cables far away from Signal wires much as possible. Obviously at some points they will have to meet but reducing how close the wires and components come together will lower chances of electrical noise interference.

Regards the wiring design then just keep it simple don't go too crazy with the safety side. Many folks go way OTT with safety buying expensive Safety Relays when all that is needed is simple Relay driven latching E-stop circuit.
Ideally, you want to use 24Vdc for the Safety circuit and limit switches,relays etc as this gives greater immunity from noise interference. Can use 12V but 24V is best, avoid using 5V if possible.

Also, for new builder it's a good idea to build control in stages rather than wiring every thing at once only to find out something wrong at switch on and then struggle to diagnose where gone wrong.

If you give detailed list of all the stuff you have I don't mind drawing you up diagram.

[GrahamWhite]

That would be great cheers :)
So far I have..
4 drivers https://www.omc-stepperonline.com/st...or-dm860t.html
Breakout board https://www.omc-stepperonline.com/st...kit-st-v2.html
UC300 eth - 5lpt http://cncdrive.com/UC300.html
24v PSU
5v PSU
toroidal psu with no bridge rectifier or caps as driver accept AC
stop/start button (1no 1nc) NVR
emergency stop button
2.2kw water cooled spindle with VFD
water pump for spindle
big enclosure

Still to buy - control cable?
limit/home switches- do you have them at each end or just for home position?

[GrahamWhite]

Thanks for spotting that :) but after nothing was working to start with, a quick read of the manual pointed me in the right direction :) shame it doesn't have any tips on not letting smoke out!

Sent from my SM-N910F using Tapatalk

[GrahamWhite]

So my mate who wired up my panel popped round :)
Multi meter came out and a quick decision was the PNP proximity limits I had were wrong ,they did actually need to be NPN-tried 2 he bought with him and all good :) pass as to whats the difference! so theyre on order:)
Moved onto the spindle which I was having real problems with as well ,trying to get the speed control working was a challenge!
The ST-V2 bob is a strange beast it turns out! what with the limits being right but actually wrong the spindle wouldn't keep it's speed ,it just kept dropping off???
So after trying just about every combination of pins and reverse settings we got to minimum and max speed% in the UCCNC software.
It was 10% min 100 MAX.
Set it to 100% minimum and 10% max and all good!!!!!! can't figure it out but speed control is working well and powers on and off fine.
Any ideas as to why are very welcome :)
2 steps nearer to a first proper run woohoo!!!

[GrahamWhite]

So new limits fitted and working :)
had to go for a first cut of something ,so a simple letters with a vee bit.
https://www.youtube.com/watch?v=XRlZwimHxHw
Amazed , IT WORKS!!!
Did hit the panic button on the first plunge ,was a bit jumpy! lol so had to start over :oops:
Need to setup speeds now as I think it's running fairly slow- working out UCCNC is very new to me(but then all of this is!)
Radiator cooling to go on and to make some permanent adjustable limit stops.
I'm nearing the 'Completed machines' section!!!
Gotta run breakin wizard and then surface my spoil board.
One thing I did try was cutting a circle and it came out oval- maybe I haven't quite got the calibration on the X right?

[GrahamWhite]

So radiator cooling is on and working :) and limit stops printed and fitted.
Are there any setup routines to go through to determine max. running rates for rapids etc.??
It seems to jog fine but on a few test runs I've done, on small circle movements say approx. 20mm across it tends to judder slightly, any ideas as to why???
Maybe I have the steps setup wrong?

[Neale]

How are you generating your gcode for the test circles? A common problem is not using constant-velocity settings for curves. If your gcode is coming out with a series of straight line segment approximations to a curve, and Mach3 is set to follow these exactly, it stops the machine at each "corner" and then restarts in the new direction. Result is vibration/juddering. Set it to "constant velocity" and it will approximate the straight line segments by rounding the corners very slightly but it keeps the machine running steadily. Even better is to get your CAM programme to generate arcs rather than straight-line approximations and Mach3 can do a better job still.