A boreing question

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EpicentrE
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A boreing question

Post by EpicentrE »

Hi all,

I need to bore out the centre of some tiny, tiny gears (around 3-3.5mm diameter) from 1 to 1.5mm, but I can't find any way to hold them securely enough that they don't rotate, but not damage the teeth in the process. Turning down the shaft is another option, but I don't have a lathe, so I'd have to do it in a bodgey fashion on my mill. Anyone got any suggestions?

Thanks.
Scott Fyfe-Jamieson, Captain of Epic Robotics. Champion of AWS38/41/42.
http://www.epicrobotics.co.uk
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Shakey
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Re: A boreing question

Post by Shakey »

Take 3 gears and bolt them in a triangle so that you can put the gear to be drilled in the middle meshing with them (Lock the 3 gears from turning)? Should hold it in place.
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terminaldamage
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Re: A boreing question

Post by terminaldamage »

Alternatively, if you have any collets from your mill that are small enough for 3-3.5mm, clamp them in that (with the collet holder in a vice or something) then drill it out with a drill, if hand/power tool accuracy isn't a problem. Alex's method sounds better though.
Jamie McHarg
RogueTwo Robots
www.rogue-two-robots.vze.com

With great power, comes great reliability.
EpicentrE
Posts: 831
Joined: Mon Jun 09, 2003 12:00 am
Location: Coventry
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Re: A boreing question

Post by EpicentrE »

Thanks for the suggestions; I don't have enough spares of the gears to make a rig like Alex suggested, otherwise that would be a great idea. I do like the collet idea however; I'm going to print some collets that are the perfect size and something to clamp them in. Thanks for the help.
Scott Fyfe-Jamieson, Captain of Epic Robotics. Champion of AWS38/41/42.
http://www.epicrobotics.co.uk
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