Fin jigs

[scott johnson]

Here is my fin jig for the BT-60 body tube. I made it from 1" aluminum angle and a scrap piece of 3/8" aluminum plate. The plate is slotted for the angle which was pressed in and secured with Loctite EA 445 epoxy. The angle pieces were milled to give the proper height to the tube centerline, minus 1/16". It works great for 1/8" fins......if I build something smaller I will have to shim the tube and fins to get them on the CL, but I built it with Big Bertha on the mind. I also made some out of 1" aluminum angle, slotted 3/32", 1/8", 3/16" and 1/4" for doing one fin at a time.

IMG_3034[1]

• scott johnson
• Aug 21, 2018

IMG_3033[1]

• scott johnson
• Aug 21, 2018

IMG_3029[1]

• scott johnson
• Aug 21, 2018

IMG_3027[1]

• scott johnson
• Aug 21, 2018

IMG_3025[1]

• scott johnson
• Aug 21, 2018

IMG_3024[1]

• scott johnson
• Aug 21, 2018

 

[scott johnson]

It is offset so it can be clamped to the edge of a table which allows clearance for the bottom fin.

 

[lakeroadster]

Nicely done...

Purpose Built Fixturing: I built a jig out of wood for my X-Wing. it's 40 degree fins and BT-50 body tube made for close constraints.