The tapered reamer self centres and you don't have to worry ... just keep it straight and I usually attack a prop from the rear.... APC advise that.
I do not like stepped reamers as all the ones I've seen wear out and then you are stuck with inaccurate reamer size. The tapered though - it doesn't matter as you can always insert a prop adaptor ring if necessary where you may have gone too large.
A prop does not need to have entire shaft hole bearing on shaft ... as long as the narrow part of the taper sits on shaft snug - that's all that's needed. The prop nut will cause the prop to sit square to the thrust washer ..... Once tightened up - prop is fine.
When a prop needs quite a lot of reaming - such as large glow jobs .. I ream both sides - front and rear - that way I do not end up with over large entry hole one side.
NEVER bore or drill a prop shaft hole ... even with a Pillar Drill - the drill bit can go off-centre. You only need a tiny deflection or angle to the hole and BHAM - useless vibrating, off-balance prop.
I have been doing this a couple of years now and have been very active in building, crashing, rebuilding etc.
There is something which disturbs me that maybe you people can help me out with.
I have purchased both Standard, and Metric reamers, and it seems I still Never have the right size for prop adapters. This drives me crazy!
I cannot believe that a man willing to buy tools is STILL stuck reaming electric props with a set of needle nose plyers.
What do I have to get to make this stuff work?
I though it was the props and shafts I am buying but then I still have the issue with props and adapters on high end foamies.
is there a tool or reamer that I don't know about?
If you're flying with electric power, check out those APC-E Electric props. These propellers come with a standard size hub diameter, and use a drop in ring type adapter that matches the shaft diameter of your motor.
That ring adapter includes five shaft diameters, with the outside diameter of the ring matching the inside diameter of the propeller hub.
I have various E props that I still have to ream ... but yes Denny - the rings are a great asset when props have them.
Even better are the ones that have rings for front and back ... so you can accommodate tractor and pusher with same prop. Most props have the rings for the rear of shaft hole ... this is then a problem on a pusher as the ring is not held by the prop saver band. It's ok if you use a washer and nut. So some of the APC style from HK have rings that fit back and also rings that fit front .. took me a while to realise that !! I've shown others who also didn't realise it ...
It was that I couldn't understand why the prop-boss had a recess at back and front .. when other props only have at back.
A reamer is a good tool to have anyway ... it's not only props that need holes enlarging ...
My HK reamer has a sharp point - that pricks through plans into wood / foam ... it opens up servo arm holes ... pricks covering and the 'blade edge' slices plastic / covering nicely ....
The eBay reamer does not have the sharp point but is hardened and able to ream just about anything I put to it.