Originally Posted by
wpadams
Thanks for machining advice, I have diagonal knurling tools but forgot there are parallel ones too. BTW I have some engines of East European origin that don't have radial grip patterns; instead parallel ridges are machined across the entire driver face, cut very cleanly. So the radial solution is not the only one...
Indeed-the Russians specialise in a 'square cross hatch' pattern...whereas the Czechs (MVVS especially) seem to prefer a series of parallel V-shaped grooves across the prop driver. I suppose its driven by a combination of production time versus available tooling as to what method you use in preference....
This is a useful reference:
Ron's Model Engineering and Model IC Engines Index see under 'resources' on the left hand side menu-it opens up and one of the subtopics is 'how to' ..click on that and the 7th topic on the 'How To' page is 'knurl prop drivers'
ChrisM
'ffkiwi'