Re: [CAD_CAM_EDM_DRO] suggestions for router lead

Hi Graham,

You don't mention the size of your router, but I'd suggest getting some
1/4"-20 threaded rod for a PCB sized project. Then drive 1:1 with
steppers. At half-step, this will give you 8000 spi, or .000125"
resolution. ACME screws would be better, of course.

Alan KM6VV

"Graham Stabler " wrote:

>
> I am trying to design a small CNC router based around a Dremel or
> similar. I have decided upon a fixed bridge design with Y axis on
> the bed and X,Z on the bridge. I thought that this would give me a
> nice stiff machine and maximise the force available from the Y
> stepper.
>
> Anyway, I'm looking into leadscrews. I am considering acme screws
> with Delrin nuts but am having a hard time deciding on the lead I
> should go for. Obviously more lead gives greater speed but
> resolution suffers.
>
> I want a reasonable swift machine that will do some basic pcb
> milling, ply part cutting and mould making. The design is based on
> an A4 paper sized bed and is designed to be sturdy as I intend to use
> quite a lot of 1/2" ali in the construction. Steppers a 200 step
> bipolars.
>
> Cheers,
>
> Graham Stabler
> Nottingham, England.