here are the drawings for the mini and honda diffs.



sorry about the pics but turn your computer on it's side to read them

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Research is the difference between speculation and investment. Anyone who copys some one else will always be second
www.minisprintgt.com

spectacular david ,thank you ,ill have a bash at it on my little lathe

when i get some bits .


i agree with you ,when i machine gears and shafts ,once you can get under the case hardening its straightforwards .some times its easiest to grind the hardening off and then machine .


regards
robert

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just try it ..see if it works .

http://www.youtube.com/user/legrandphromage

I recognise that lathe!!

You can use ceramic inserts to hard turn stuff that's up to about RC62 hardness, no pre-grinding needed.

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DrMini- 1970 wasaMatic 1360, Mk1S crank, 86.6HP (ATW) =~125 @ crank, 45 Dellorto (38 chokes), RE282 sprint cam, 1.5 rockers, 11.0:1 C/R.

so true dr , but a bit of pre spending is !

_________________
just try it ..see if it works .

http://www.youtube.com/user/legrandphromage

ceramic inserts are only good if the surface of the metal is smooth. If it is a cast surface the ceramic will chip due to uneven cut.

There are plenty of carbide compound tool bits that are more suitable. I was give some that are used in a 14" slab cutter that is being used to machine the latest type of armour plate.

Most of the milling cutter inserts are better for impact and harder wearing than lathe inserts. Just have to make a holder to suit.

Same for drilling, a carbide ball end 2 flute end mill will punch thru any case hardening you will find on a mini where the best high speed drill will just melt.

_________________
Research is the difference between speculation and investment. Anyone who copys some one else will always be second
www.minisprintgt.com

So whats the go? If i bought a honda ATB and got it all machined will it still be cheaper than a mini ATB?

David there are some pretty hi-tech ceramics now, with reinforcing whiskers in em.. they handle interrupted cuts, eg milling.
see http://www.greenleafglobalsupport.com/w ... Grades.pdf

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DrMini- 1970 wasaMatic 1360, Mk1S crank, 86.6HP (ATW) =~125 @ crank, 45 Dellorto (38 chokes), RE282 sprint cam, 1.5 rockers, 11.0:1 C/R.

probably not - if you were to pay someone to do the machining the costs would add up quickly. This is the kind of job you only do if you can do it yourself

We can scratch that idea off the list then. Probably best to stay with a mini ATB anyway because if you break a crown wheel you can jusy order another instead of paying all that money for remachining again