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Drilling holes in pistons

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  • 1 Post By daleburr
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Drilling holes in pistons

Old 02-26-2020, 11:03 PM
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Default Drilling holes in pistons

Whats the best way, or tips ,for drilling clean holes in delrin shock pistons.

The last set gave me hard time to completely remove the burrs created by the bit. Even by hand still not satisfied with them.
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Old 02-27-2020, 12:53 AM
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It is often better to drill a smaller hole first and then the final diameter ( preferably with a reamer). Using new drills helps. Lubrication can help (special products, or WD 40, any oil etc.)
Obey, that deburring can change the hole intrance geometry. Very good funnel like entrance can increase oil flow by 15% up to 25%.

Last edited by Erhard; 02-28-2020 at 08:42 AM.
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Old 02-27-2020, 01:47 AM
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You'll need a drill press to do it accurately
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Old 02-27-2020, 10:17 PM
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Originally Posted by daleburr View Post
You'll need a drill press to do it accurately
Of course! I had assumed this is clear.
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Old 02-28-2020, 05:29 AM
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You do not need a drill press with new bits and a steady hand and very simple to perform the biggest task is getting rid of the burs when completed
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Old 02-28-2020, 06:31 AM
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Old 02-28-2020, 06:55 AM
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Pick up some circuit board drills. They come in every diameter we would need for pistons and cut very clean. Amazon and Ebay list them from various places.
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Old 02-28-2020, 07:01 AM
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Go to the Midwest Circuit Technology website, they specialize in mini drill bits and cutter bits. Drill bits are available in .05MM intervals and have a 1/8 shank, so they fit in a Dremel tool perfectly. I've ordered from them for several years now and their service is top notch and it always ships quickly.
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Old 02-28-2020, 07:07 AM
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But why?
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Old 02-28-2020, 12:27 PM
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FWIW, I recently bought the Pilot R/C set linked above. A really nice set with an aluminum handle that has a rotating base so that you can spin it comfortably in your hand (your hands may vary). You get a 1mm bit, then 1.2 to 2.0mm bits in .1mm increments.
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