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Old 05-04-2013, 08:42 PM   #1
Bill Harris
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Default Prop adapter question

Fit to the shaft being equal, does it matter whether the collet adapter has slots dividing the taper into three or four segments? Or if the flange for the rear of the prop hub has milled grooves to let it get a bite on the prop hub? I've got a choice between two prop adapters. Not a big power system-- a 60 watt 2205 motor with a 3mm shaft swinging a 5x3 three-blade prop.

--Bill
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Old 05-04-2013, 09:48 PM   #2
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Originally Posted by Bill Harris View Post
Fit to the shaft being equal, does it matter whether the collet adapter has slots dividing the taper into three or four segments? Or if the flange for the rear of the prop hub has milled grooves to let it get a bite on the prop hub? I've got a choice between two prop adapters. Not a big power system-- a 60 watt 2205 motor with a 3mm shaft swinging a 5x3 three-blade prop.

--Bill
Not to my knowledge. The only question is how tightly the collet adapter fits on the motor shaft. It should have zero wobble before the collet is tightened up when the prop is installed.

Be aware that down the road, if you want to remove the adapter from the motor shaft, you might need a gear puller. Those collets on my Hacker A40 and A50 motors are so tight on the motor shaft, nothing else will pull them off. (My Hacker A60 motors have a threaded shaft, no collets.)

What I've used is a automotive battery cable puller, found at the local hardware store. These pullers require a lot of clearance, so if your motor is buried inside a bunch of cowling, it could be an issue.

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Old 05-04-2013, 10:00 PM   #3
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4 will technically "grip" better but I am with Denny - I have a hard time getting my larger ones (even 3 and 2 "slice" ones) off when tightened well. Especially the large ones. I know many that don't trust them - but they are VERY reliable IMHO.

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Old 05-04-2013, 10:52 PM   #4
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I didn't think there'd be a practical difference, but I've not had a choice before so I thought I'd ask.

I have good results removing a collet by supporting the outer tapered ring and gently tapping the threaded shaft/inner taper loose. Sometimes it takes surprising amount to tapping to break one loose. At my LHS I saw a "collet removal puller", by Hyperion, I think. It might be worthwhile picking one up.

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Old 05-05-2013, 12:31 AM   #5
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Originally Posted by Bill Harris View Post
I didn't think there'd be a practical difference, but I've not had a choice before so I thought I'd ask.

I have good results removing a collet by supporting the outer tapered ring and gently tapping the threaded shaft/inner taper loose. Sometimes it takes surprising amount to tapping to break one loose. At my LHS I saw a "collet removal puller", by Hyperion, I think. It might be worthwhile picking one up.

--Bill
Yeah, I've thought of that, but a concern is the ball bearings in the motor. These are small, highly loaded bearings, and a accidental sharp rap on them could "Ball Dent" these bearings.

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Old 05-05-2013, 12:34 AM   #6
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A collet puller would be nice... Hmmmmm
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Old 05-05-2013, 02:34 AM   #7
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I use an adjustable jaw pliers, loosen the 'nut' then grabbing the front and back edge (assuming clearance) I simply squeeze and it pops loose...most of the time.

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Old 05-05-2013, 03:05 AM   #8
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Originally Posted by DennyV
I've thought of that, but a concern is the ball bearings in the motor.
I wouldn't think there is a danger, the motor/adapter is supported by the outer collet collar and the threaded adapter shaft is tapped, so there are no forces transmitted through the bearings, as such. But I see your concern-- the bearings are inconceivably small and an abnormal shock might well affect them. Good point.

Originally Posted by Rcers
A collet puller would be nice... Hmmmmm
I looked them up at the Hyperion website:

Collet Adapter Puller for M5 and M6 adapters

If you have ever faced not being able to slide off the collet adapter from the motor shaft, then this is your rescue. Quickly and easily, and without any damage to your motor shaft or model, you can pull off the prop backplate and slide the adapter off with no sweat.

http://hyperion-world.com/products/p...HP-ADAP-PULL01
http://hyperion-world.com/products/p...HP-ADAP-PULL02

I think they'd be handy...

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Old 05-05-2013, 03:34 AM   #9
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Originally Posted by Bill Harris View Post
I wouldn't think there is a danger, the motor/adapter is supported by the outer collet collar and the threaded adapter shaft is tapped, so there are no forces transmitted through the bearings, as such. But I see your concern-- the bearings are inconceivably small and an abnormal shock might well affect them. Good point.
Yeah, sound good. But my concern is, after the collet "Pops off" while tapping with the hammer, that motor shaft is going to move quickly. And that shaft is going to take the motor frame with it, through its ball bearings.

Maybe its not a problem, but a puller takes care of the issue.

That commercial puller looks quite interesting.

As for the Channel lock pliars, I've tried it. Didn't work on a Hacker A50 series motor. Those things are very tight.

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Old 05-05-2013, 08:10 PM   #10
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Oh, agreed. I think I've been lucky tapping the collet loose.

All e-RC is a local distributor that carries the pullers (M5 and 6 are backordered). There may be other dealers.

--Bill


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