Drilling out a standard batterydrill pinion ain't an easy job. Pure hardmetal cutters are the least you need, and then the chances of succes are limited. The aussie forum has quite a few threads on that.
I myself prefer to make gearboxes with standard, affordable mod 1 gears.
The pinion I prefer is the steel Z12 Mod 1. You can buy those easy enough over the net.
I use a straight flute solid carbide drill for enlarging pinion bores and it works extremely well. I can find some links if anyone wants to try them.
Nick, PM me those links, thank You.
I can see holding the gear being the biggest issue.
I don't think its possible to drill them unless its clamped in a vice on a proper pillar drill or a lathe...with lots of coolant.
The material is probably cast, its very hard and gets hot quickly. I cracked two pinions while drilling them on a lathe with a Co twist drill. Used a spade drill and reamer for the third gear...it worked
I plan on just re using my banebots gears...
The easiest way to get the gears would be to buy some gear stock the right size, part off a load of them, get em hardened and sell them.
Here is how you drill out the gears:Originally Posted by PJ-27
I use an ER-32 collet chuck to hold the gears in my Seig lathe. The carbide drill cuts thru them like butter and I just used a little WD-40 as lube & coolant.
That's what I would do too nick.
Just received some 775s from banebots. They appear to have slightly different cases to the originals, but will check all dims out and report.
Nice one ed- when did you order them?
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