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Feb 21, 2013, 10:11 PM
Just Another Brick in the Wall
kenh3497's Avatar
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How I install Robart Hinge Points


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Last edited by kenh3497; Feb 23, 2013 at 07:42 AM.
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Feb 22, 2013, 06:34 AM
Registered User
What does McMaster Carr call the transfer buttons? Can you give a McMaster part number?

'Sure would take some of the guesswork out of lining up the hinge points.

Thanx!
Feb 22, 2013, 12:08 PM
Just Another Brick in the Wall
kenh3497's Avatar
Quote:
Originally Posted by AL_T View Post
What does McMaster Carr call the transfer buttons? Can you give a McMaster part number?

'Sure would take some of the guesswork out of lining up the hinge points.

Thanx!
Here ya go Blind hole transfer punch.... http://www.mcmaster.com/#transfer-punches/=llas53
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Feb 22, 2013, 01:49 PM
Just Another Brick in the Wall
kenh3497's Avatar
I've been looking at that style and can't find the drill that has the correct taper. I might wind up making something to fit the Robart taper. It wouldn't be all that hard to do if I could get motivated to do so

Ken
Last edited by kenh3497; Feb 23, 2013 at 07:31 AM.
Feb 22, 2013, 05:38 PM
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N1EDM's Avatar
I would have never thought of that Transfer Punch. Thanks for that idea!! I think I'll make one of those as well.

Bob
Feb 23, 2013, 07:36 AM
Just Another Brick in the Wall
kenh3497's Avatar
Way back when I was doing a tiny bit of tool & die work we used them all the time to transfer holes from one part to the other. I suppose now days it done via CNC machine.

I forgot to mention, and I'll edit the first post. DO NOT round or taper the aileron before drilling the holes. Having the square and flat face on the aileron helps the drill jig do it's job properly.

Ken
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Feb 24, 2013, 02:30 PM
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tailskid2's Avatar
Ken thanks for the tip and your pics.....gonna git one of dem ther toolssss...
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Feb 24, 2013, 02:45 PM
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N1EDM's Avatar
For anyone looking for those transfer buttons, as mentioned earlier, they are available from McMaster-Carr. Here are the details:

www.mcmaster.com . Do a search for p/n 3414A211 . You can buy a pack of 6 1/8" punches for $5.25.

Bob
Last edited by N1EDM; Jan 25, 2015 at 07:13 AM. Reason: Corrected the McMaster p/n
Feb 24, 2013, 02:56 PM
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tailskid2's Avatar
Can they be purchased through a local store (if so which ones) or do you have to mail order them?
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Feb 24, 2013, 03:34 PM
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N1EDM's Avatar
Sometimes they are carried by a dedicated woodworking store like Rockler, etc. Do you have any of those near you? If so, check that they carry the size that you're looking at.

Just my $.02

Bob
Feb 24, 2013, 03:40 PM
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tailskid2's Avatar
I think we have a 'WoodsMaker' or something like that here in Phoenix...I bet they have them.....
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Feb 24, 2013, 09:49 PM
Just Another Brick in the Wall
kenh3497's Avatar
It might be worth mentioning I dove right in to my first hinging experience with my new tools on an airframe. It came out pretty good but I did miss the mark on a couple of holes. The second time all was good.

As with anything, a little practice makes for a better job. It might be prudent to waste a little balsa and install a couple of sets it some waste before doing the real thing.

Ken
Latest blog entry: Second time around
Feb 25, 2013, 08:21 AM
NE Texas, USA
Patchitagain's Avatar
HI Ken,

I've been looking for a tutorial such as this, many thanks... Just curious though, since these jigs align the holes in the center, which is fine for the ailerons, how would you create the holes for flaps ?

thanks,

Paul
Feb 25, 2013, 08:33 AM
Just Another Brick in the Wall
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Quote:
Originally Posted by Patchitagain View Post
HI Ken,

I've been looking for a tutorial such as this, many thanks... Just curious though, since these jigs align the holes in the center, which is fine for the ailerons, how would you create the holes for flaps ?

thanks,

Paul
I assume you want the hinges to protrude from the bottom of the wing. I would make up a wooden drill jig to reproduce the angle you want. You could line the hole with a brass tube so the drill does not eat he wood away. The jig would need to have a "notch" to fit the back of the wing and the bottom at the same time. Matching the holes from surface to surface will be much trickier though. You might just wind up with drawing a lines across the parts at the hinge locations and doing the best you can. I would tape the flap to the wing and draw a line across the location where the hinge will be located. The nature of the beast may necessitate having the holes a tad sloppy so the hinges will align better. Take some extra time to align everything.

Thinking out loud here.... measure from the center of the hole in the jig to the outside of the jig. We'll say it's 3/8 of an inch just for arguments sake. Now measure off your hinge center line 3/8 of an inch. Align the edge of you drill jig to your off set line and you should have perfect hole alignment... At least in theory. Making a few test holes in some scrap would be a very wise thing to do to test your technique and drill jig.

Ken
Last edited by kenh3497; Feb 26, 2013 at 10:06 PM.


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