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  #1  
Old 09-16-2024, 05:11 PM
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HenryMac HenryMac is online now
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Default Lakeroadster's Fin Alignment Guide
I decided to take a crack at making a fin alignment guide.

My design is basically the same as TRF Memeber qquake2k with the exception of being double sided. One Side is for BT-60 thru T-400 tubes, the other is for BT-20 thru BT-55 tubes.

Here's the CAD drawings:
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Old 09-16-2024, 05:12 PM
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Armed with the drawings I headed out to the barn to make some sawdust. I changed the design a bit, making 4 longer legs for the base.

I mocked up the parts for a visual representation... once the glue dries and I get a couple carriage bolts, I'll post up some more photos.
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Old 09-17-2024, 01:57 PM
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Here's the finished jig / fixture.

I ended up using 3/8" dia. x 3-1/2" Carriage Bolts, washers and wing nuts. The wing nuts were $2.48 each? :facepalm:

For the mock up photos l used a piece of BT-60 and a left over plywood fin from my Spad Ace build, and that's a BT-50H for the smaller tube.
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Old 09-17-2024, 03:52 PM
Ltvscout Ltvscout is offline
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You do some great custom work, John. I appreciate you sharing your builds here with the other members of YORF!
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  #5  
Old 09-17-2024, 04:01 PM
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Quote:
Originally Posted by Ltvscout
You do some great custom work, John. I appreciate you sharing your builds here with the other members of YORF!
Thanks, yorf certainly welcome
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Old 09-17-2024, 04:53 PM
Les Les is offline
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Question
Looking at the end view with the miters (sht 5)
On the right side, if the miter was 30 deg instead of 45, do you think it would support a 4 fin rocket? This would shorten the "body" of the board to be further from the tube.
And/or route down the thickness on that side?
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Old 09-17-2024, 05:08 PM
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Quote:
Originally Posted by Les
Question
Looking at the end view with the miters (sht 5)
On the right side, if the miter was 30 deg instead of 45, do you think it would support a 4 fin rocket? This would shorten the "body" of the board to be further from the tube.
And/or route down the thickness on that side?
30 degrees would make the body tube very close to the fixture...

Routing down the thickness would be the best, but then that would limit that side to only smaller tubes.

It's really all a compromise. Ideally you'd have 3 or 4 fixtures if you built that many varied body diameter rockets.
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Old 09-17-2024, 05:31 PM
SolarYellow SolarYellow is offline
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I played with the angle in AutoCAD with various tube sizes and decided that I liked 40 degrees the best.
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  #9  
Old 09-17-2024, 05:57 PM
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Quote:
Originally Posted by SolarYellow
I played with the angle in AutoCAD with various tube sizes and decided that I liked 40 degrees the best.
If 40 works... so will 45.

45 degrees is foolproof for cutting miters. Just set the table saw and start cutting.
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