Re: [CAD_CAM_EDM_DRO] Re: Re: re:Re: Lead screws for ever...(plastic)

Hurro...

> Don't be surprised re: the kerks vs. ballscrews price. Similar
> tolerances and machining needed. Similar markets.

I was suprised, as they were more exspensive... I was setup for the fall by
a chap from the SKF dealership here telling me they were significantly
cheaper.. Maybe he just wanted me to come back begging and scraping for
some of thier ballscrew assemblies :-).

> Something not often mentioned in the choice of ballscrews vs. ??? is
> that ballscrews are EXTREMELY intolerant of dust/dirt/swarf/etc.!

I've already got the bellows sorted out... at the end of the day this
machine is going to cut balsa and plastic for models, probably not a big
deal.. I also intend to have a "chip vac" or at least a buggered old vacuum
cleaner...

> Re: making your own nuts... I mentioned in this thread earlier that

I recognise that it's going to take ages for me to make my own nuts (Did I
just say that?)...

My problem is that I have a quote sitting on my desk for nearly $4000.00 NZ
for the three screws/nuts I want. Considering this is a hobby machine after
all I'd rather spend that money on something like tooling for the lathe.
Even if I learn a heap (read stuff up lots) making my own acetal nuts for SS
leadscrews I'm sure I could still get the end product for well under $1000
for all three axis, time isn't really a problem, and SS leadscrews are
cheap.

The other up side of doing it myself it that if it works I'll be able to
pass on the nut design to the list. I'm just working on a design now, which
will only have 4 parts, and may even work...

Cheers, Chris.

* Design engineer, Assembly worker, Cleaner.
* Ohmark Electronics. PO Box 5302, Christchurch, New Zealand.
* http://www.ohmark.co.nz