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Distributor gears
Posted: Mon Aug 03, 2015 4:45 am
by minorv8
I bought two SD1 type distributor drive gears to fit on a pair of dizzys but hit a problem. Both are heat treated so hard that drilling a hole for the pin is just about impossible. Normal drill bit hardly scratches the surface and the Co-alloyed bits won´t do either.
A file hardly leaves any mark. Factory original gears are much softer.
Does anyone have any ideas or tips ?
Posted: Mon Aug 03, 2015 5:26 am
by Blown v8
My mate did mine,he's an engineer and ordered the specific bit,
Didn't take long with the right bit
Posted: Mon Aug 03, 2015 5:28 am
by minorv8
Yes, looks like tungsten carbide bit is needed. I contacted Rimmers to hear what they feel about the issue
Posted: Mon Aug 03, 2015 7:18 am
by unstable load
You should manage it with a Cobalt bit. Keep the speed down and keep it well lubed to cool the tip.
Posted: Tue Aug 04, 2015 4:42 am
by minorv8
You should manage it with a Cobalt bit. Keep the speed down and keep it well lubed to cool the tip.
I should but the gear is so hard that even Cobalt bit won´t work.
Rimmer´s advice was to take it to an engineering shop. Excellent customer service
Posted: Tue Aug 04, 2015 7:39 pm
by ged
A Stellite drill will go through like a hot knife through butter! Pricey though.