Hi,
I'm considering having a small batch of parts machined in ally. The parts are for a collet style prop driver for electric motors for rc model plane use and are intended to get round the deficiencies of commercially available parts.
A set would comprise the following :
1) an M8 Nut in ally,2) a 19mm ally washer 2.5mm thick at the center thinned on one face to
1.5mm at the rim and drilled 8mm clearance,3) a prop shaft adaptor machined from ally bar 30 mm long and externally threaded M8 for half its length. The remainder of the length comprising a parallel 8mm diameter section terminating in a conical section that broadens to 10mm over the final 8mm of the shaft length (cone half-angle is 7 degrees). This conical collet section to be slit approx 1mm for the length of the cone + a few mm for luck. The whole shaft drilled through its length with a 5mm hole to accommodate the electric motor shaft,
4) a prop driver machined from ally bar having an axial length of 8mm, a stepped diameter of 13mm and 19 mm (step occurring half way along). Also having a conical hole matching the cone on the prop shaft (8mm at wide diameter and 10mm at the narrow diameter). Wide face to be knurled to grip prop.My expected quantities are somewhere around 1000 sets of parts.
My reason for posting is I have no idea at all how to go about getting these made, and I wondered if anyone here has ideas about what would be reasonable quantities that would be considered by small batch parts makers, what sort of prices they'd charge etc etc. Also if anyone knows any firms that are prepared to undertake this kind of work then I'd be grateful for a link. Any other comments are welcome too, of course.
Thanks in advance,