Technical & Reference Section > Tech and Restoration

cnc milling

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Peter J:
For a one off you’d be better off going to a local machinist who would make you one providing you have one he can copy or a set of drawings he can work from.

A CNC miller needs an “NC file” which is normally generated from either a 2D or 3D CAD file (DWG/DXF) if the company has to generate a CAD file there is sometimes an associated cost for a one off.

The main disadvantage with CNC machines for one off’s is the set up time and CAD file/model generation time and a skilled machinist using a conventional miller will be able to produce as good if not better and cheaper finished part.

We would charge £40 per hour + materials for “knife and fork” jobs

When we had an engineering company we’d do the “knife and fork” jobs on the conventional machines and anything that had tight tolerances/multiple/repetitive cuts would be CNC
If the spider is flat (Like a tuf neck power disc) laser cutting would be a better option normally there minimum charge would be £50 and you would get around 10-12 disc’s







I so miss making CAD models and playing with big boys tools  :'(

oldschoolace:
I bet you do Peter, i would love to have a go at all that stuff. I'm a woodman myself so occasionally get to play with a cnc but metalworking could be ace!!

Am actually looking to get a stem made. I blame that american hotrod programme, it always looks so easy on there!  >:(

rooski:
if you want a one off think £35 an hour for cad work,same for programming,same for set up and machining,plus material.

I think £200.00 could get you a one off spider :daumenhoch:

Lazer cutting a powerdisc and machining could be a lot cheaper. :daumenhoch:

oldschoolace:
I'm pretty good on cad gear as i use it for work sometimes, just need a nice man with a machine  :daumenhoch:

Peter J:
A stem would take multiple passes and cuts plus you would also need someone with a lathe as well for the stem shaft

Material wise you'd need a good general grade like 6061 (T6) or if you can find an off cut go for 7075 better strength properties but more expensive and harder to find where as 6061 is cheap and every bugger stocks it

Also consider head treatment may be needed as well to relive the metal stresses associated with machining as well as help with tensile strength................I could get really boring and go into FEA (Finite Element Analysis) but to be fair even I fall asleep discussing that.....

As for the shaft Cromo all the way and this should be threaded into the stem head using a “force fit” I cannot remember the correct terminology for it

If I was making one I would also knurl the shaft along its length...........

I’d looked at making one (a one off of my design) and even with me generating the CAD model (which I still have) the costs would be in excess of £150 but then I suppose if I’d looked at making one to a normal specification with less cuts and cheaper materials I could get it down to £70 ish

If I ever get a spare Saturday I would love to go to my old place and make one I worked out it would take about three hours for me   

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