New Build 1000x600x200mm (newbie)

[njhussey]

Neil It is close but it works OK of course you can put washers on the cap heads to spread the load.

I will do Clive, just mounted it at the moment to check it can tension OK and that I'd got the belt length correct before dissassembling for wiring and final re-assembly.

[Jonathan]

The Nema 23 boss is 1.5" - so 38.1mm. It's there to allow the motor to be mounted concentrically to another shaft by machining the mount to be a close fit on the 38.1mm diameter. In the case here, there is nothing to align concentric to, so all that is required is a cutout of enough to allow the boss to fit. There's often a +-0.05mm tolerance on the boss diameter, so in the past I've machined the cutouts to 38.2mm to be on the safe side. You don't want it tight else it will be harder to tension the belt. Also the cutout for the boss needn't go all the way through the material - 2mm deep would be plenty. e.g:

[Noplace]

thanks guys for all the info, one question on another topic: how do you mount the linear rails on steel boxes/frames ?
I'm thinking of designing the body out of that since its readily available locally instead of alu t-slot extrusions but I don't know the technique you use to mount them, seems you cant access under to put nuts for the bolts!

[routercnc]

If the steel box section is 5mm thick or so then you can drill and tap it and bolt the rails directly. You can optionally place a strip of steel inside the section clamped to the underside of the top surface and drill and tap through both to get better thread engagement.
Be aware that your rails will only be as flat and planar as the top surface of the box section so read up on epoxy mounting or shimming methods to get the best DIY result.

[Noplace]

Thanks for the great info, I would like to try epoxy but I have no experience and I'm afraid it just might be messy and don't think local workshops here have experience in doing it. would shimming be more approachable and any guides on that?

on a different topic I got my VFD (spindle still in the way) and would appreciate if you could confirm wiring:

this is a FC300-2.2KW



So L and N are input obviously, PE is ground, PB P+ are braking resistor connection.

first do I connect PE to both spindle and input ground or just input ground? I'm assuming spindle comes with 4 inputs so 3 of them would be the U V W and last one is earth, is that correct?

second, I have this board called C6 http://www.cnc4pc.com/Store/osc/prod...products_id=58 which is supposed to control the speed and on and off/dir from the software(mach3) once I connect it to my BOB.

would you be kind to confirm the connections between the board and the VFD? the only one I figured is analog output to AVI.

the board has separate ground for the analog and digital, should they be both connected to the COM inputs in the VFD? and there are two COMs which is confusing me further.

[Boyan Silyavski]

Generally you will need the C41 board not the C6 for spindle control. why did you do that?

c41
Inputs a PWM and outputs an analog 0-10VDC.

C6
• Inputs a frequency (step) and outputs an analog 0-10VDC.




Read the manuals how to connect them:
http://cnc4pc.com/Tech_Docs/C6R6%20and%20Huanyang.pdf

as an answer to your question from the manual:
Make sure the grounds of the analog circuit are keep
isolated from the logic (+5vdc). Use a multimeter to confirm there is no
continuity between the two grounds before applying power.


Dont be in a rush.

[Noplace]

I'll be using the C6 with C35 from same site, I checked with their support and they confirmed that they work together so I assume it would work and mach3 could output the required frequency(step) signal, did I miss something? please enlighten me :D