Prop hole drilled off-center - now what?
03-30-2006, 09:39 PM
#2
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RE: Prop hole drilled off-center - now what?
Yup, buy a new prop! 
Sorry, but there is no way to fix this. It would not be a good idea to even attempt to remedy an off center prop hole. Next time, dont use a drill; a drill press, or even better, a prop reamer is the best way to go to enlarge a prop hole.
Sorry, but there is no way to fix this. It would not be a good idea to even attempt to remedy an off center prop hole. Next time, dont use a drill; a drill press, or even better, a prop reamer is the best way to go to enlarge a prop hole.
03-30-2006, 09:46 PM
#3
RE: Prop hole drilled off-center - now what?
If you have access to a Bridgeport you could use a boring head and put it back in location albiet oversize.
Otherwise get a wood working craft catalog and buy a clock face for it and hang that bad boy on a wall or make a gift out of it.
Otherwise get a wood working craft catalog and buy a clock face for it and hang that bad boy on a wall or make a gift out of it.
I was afraid of your answers...Oh well, I have a GREAT epoxy stirrer!
03-31-2006, 01:14 AM
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RE: Prop hole drilled off-center - now what?
Or you can take it oversize with an end cutting end mill and bush it. The key is having the equipment to find the true center and the ability to hold it in place while the new hole is being bored. holding it by hand under a drill press or trying to use a hand drill will not get the job done.
I have recentered more than one prop for others with no problem but then I have a lathe and a mill in my garage.
I have recentered more than one prop for others with no problem but then I have a lathe and a mill in my garage.
ORIGINAL: vicman
If you have access to a Bridgeport you could use a boring head and put it back in location albiet oversize.
Otherwise get a wood working craft catalog and buy a clock face for it and hang that bad boy on a wall or make a gift out of it.
If you have access to a Bridgeport you could use a boring head and put it back in location albiet oversize.
Otherwise get a wood working craft catalog and buy a clock face for it and hang that bad boy on a wall or make a gift out of it.
03-31-2006, 02:12 AM
#8
RE: Prop hole drilled off-center - now what?
Finding the true center would be key....the mill would be dandy.
Just about every prop I've drilled in 37 years was on a drill press. I let
them center themselves when I start....then hold them down, and go
through into wood underneath. I don't recall screwing one up. I have hand
reamed maybe a couple props....only at the field, and only in an emergency.
Had I not been sucessful with this metod, I would have found another way
to do it a long time ago....each to his own.
FBD.
Just about every prop I've drilled in 37 years was on a drill press. I let
them center themselves when I start....then hold them down, and go
through into wood underneath. I don't recall screwing one up. I have hand
reamed maybe a couple props....only at the field, and only in an emergency.
Had I not been sucessful with this metod, I would have found another way
to do it a long time ago....each to his own.
FBD.
03-31-2006, 02:42 AM
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RE: Prop hole drilled off-center - now what?
Stick it on the shaft of a small electric motor and you've got a workbench fan . . .
I use B&B's [link=http://www.bennettbuilt.com/page9.htm]prop drills.[/link]
I use B&B's [link=http://www.bennettbuilt.com/page9.htm]prop drills.[/link]
03-31-2006, 08:14 AM
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RE: Prop hole drilled off-center - now what?
Finding the true center is pretty easy, all you need is the centering device that is designed to clamp over the prop hub and slide around until the prop balances. Somebody was making these things and selling them in the model mags for redrilling large diameter props.
I have also drilled many a prop on a drill press and always use the superior centering qualities of a reamer whenever possible.
Off center holes just like non parallel faces on a prop hub can be fixed with complete safety if the equipment and skill are available for the task.
I have also drilled many a prop on a drill press and always use the superior centering qualities of a reamer whenever possible.
Off center holes just like non parallel faces on a prop hub can be fixed with complete safety if the equipment and skill are available for the task.
ORIGINAL: Flyboy Dave
Finding the true center would be key....the mill would be dandy.
Just about every prop I've drilled in 37 years was on a drill press. I let
them center themselves when I start....then hold them down, and go
through into wood underneath. I don't recall screwing one up. I have hand
reamed maybe a couple props....only at the field, and only in an emergency.
Had I not been sucessful with this metod, I would have found another way
to do it a long time ago....each to his own.
FBD.
Finding the true center would be key....the mill would be dandy.
Just about every prop I've drilled in 37 years was on a drill press. I let
them center themselves when I start....then hold them down, and go
through into wood underneath. I don't recall screwing one up. I have hand
reamed maybe a couple props....only at the field, and only in an emergency.
Had I not been sucessful with this metod, I would have found another way
to do it a long time ago....each to his own.
FBD.
03-31-2006, 09:50 PM
#12
Senior Member
RE: Prop hole drilled off-center - now what?
That prop can be saved. Get a tight-fitting HARDWOOD dowel and CA it in place, then redrill. Use thin CA and soak the area until no more soaks in. I've repaired several oversize prop holes this way and have had no failures.
Measure the prop from tip to tip. Measure the hub from side to side. Drill your hole at the crossmark and rebalance the prop. Unless you're turning MAJOR rpms, it will do fine.
Dr.1
Measure the prop from tip to tip. Measure the hub from side to side. Drill your hole at the crossmark and rebalance the prop. Unless you're turning MAJOR rpms, it will do fine.
Dr.1
