Re: 8x4 Build based on plans by Joescnc Hybrid R&P
Quote:
Originally Posted by
GrahamWhite
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.
Re: 8x4 Build based on plans by Joescnc Hybrid R&P
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?
Re: 8x4 Build based on plans by Joescnc Hybrid R&P
Quote:
Originally Posted by
GrahamWhite
limit/home switches- do you have them at each end or just for home position?
My preference is to combine the Home-limit switches and have the switch travel with the axis sensing/hitting fixed targets at each end. This way fewer switches to go wrong and less wires running around machine.
Will you be using Micro switch type or proximity.? My pref is proximity NPN type.
Re: 8x4 Build based on plans by Joescnc Hybrid R&P
just had a look and the proximity NPN type are cheap enough and I like the idea of less switches=less cost! lol
Re: 8x4 Build based on plans by Joescnc Hybrid R&P
Quote:
Originally Posted by
GrahamWhite
just had a look and the proximity NPN type are cheap enough and I like the idea of less switches=less cost! lol
Ok but due to BOB having a common Ground you'll have to go with PNP.
Re: 8x4 Build based on plans by Joescnc Hybrid R&P
Ok thanks- I'll keep an eye out for that when I order!
Re: 8x4 Build based on plans by Joescnc Hybrid R&P
So I've learned another lesson on ordering from the USA- again the metric /imperial beast raises it's head again in the form of spur gears on the reduction drives!
And with a local company wanting nearly £100 each to machine up the appropriate MOD 1.0 spur replacement, I'm having to go for an off the shelf spur, have it bored out and get a collar turned up to fit it instead!
1 Attachment(s)
Re: 8x4 Build based on plans by Joescnc Hybrid R&P
So decided it was time to start laying out the control box :concern:
Attachment 24201
I'm gathering you try to keep the mains power stuff away from signal stuff as best as possible.
Want to try and keep VFD in there as well as I seem to have enough space ....unless I'm missing some bits! nothing big I hope!
Been looking at control cable and wondered how expensive you need to go?
4 core 0.75mm screened Flexible cable £4.13 per meter https://www.rapidonline.com/lappkabe...0-75mm-63-4774
or cheaper 809 cy flex at £2.98 per meter https://www.rapidonline.com/lappkabe...0-75mm-63-4331
Do I run the home/limit switches(magnetic PNP) in 3 core- screened also?
Re: 8x4 Build based on plans by Joescnc Hybrid R&P
Quote:
Originally Posted by
GrahamWhite
So decided it was time to start laying out the control box :concern:
Attachment 24201
I'm gathering you try to keep the mains power stuff away from signal stuff as best as possible.
Want to try and keep VFD in there as well as I seem to have enough space ....unless I'm missing some bits! nothing big I hope!
Been looking at control cable and wondered how expensive you need to go?
4 core 0.75mm screened Flexible cable £4.13 per meter
https://www.rapidonline.com/lappkabe...0-75mm-63-4774
or cheaper 809 cy flex at £2.98 per meter
https://www.rapidonline.com/lappkabe...0-75mm-63-4331
Do I run the home/limit switches(magnetic PNP) in 3 core- screened also?
Check out if reichelt will ship to UK.
For cy 4x1mm2 i ended up paying 1.20 €/mtr for 50 meters delivered at my house.
Grtz Bert
Verstuurd vanaf mijn SM-A320FL met Tapatalk
Re: 8x4 Build based on plans by Joescnc Hybrid R&P
At 1.20 euros a meter was that for chain flex? I've seen prices for cy shielded from £0.60p per m but it doesn't suggest constant bending i.e for chain drive
I found this company at £1.94 per m for chain flex https://www.tme.eu/gb/details/cf881....shielded/igus/
or is the chain flex over the top?? and standard CY shielded fine?
