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Title: Boring a Prop ID Post by: sanjayrai55 on December 21, 2012, 01:12:29 PM Having recently got into Electrics, I face a problem with Props.
e.g. I have a prop adapter that is 8 mm. The max bore of the props are 6 mm, sometimes 1/4" (6.35 mm) The problem is how to increase the bore without imbalancing the prop? I mean, it is easy to run an 8 mm drill through the bore, but chances are high it will imbalance the prop. Any suggestions anyone? Thanks Title: Re: Boring a Prop ID Post by: sanjayrai55 on December 21, 2012, 01:14:02 PM BTW, never faced this problem with Nitro engines. The maximum has been slight reaming.
Title: Re: Boring a Prop ID Post by: rcpilotacro on December 21, 2012, 02:30:01 PM Sanjay
Step Reamer is the best i found, you could even drill with the same dia bit (Ensure 90 to plane of rotation) Title: Re: Boring a Prop ID Post by: sanjayrai55 on December 21, 2012, 02:51:40 PM Gusty, a fixed stepped reamer will not cut from 6 mm to 8. With a drill bit, there are chances it will not be concentric to the original hole, thus the imbalance. It is possible that at the RPMs we work with (read a 1200 KV motor on 11.1 V = 13320 RPM) even 20 micron eccentricity could lead to imbalance, I think. Don't have experience of this,and I have drilled it, let's see what happens!
Title: Re: Boring a Prop ID Post by: sanjayrai55 on December 24, 2012, 10:14:25 AM OK! An update. I did this in two stages, and I did not use a drill machine, but clamped the drill in a vice, and "threaded" the prop up and down it. Shot in the dark really, but seems to have worked...no vibrations at full RPM
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