A brace chuck adaptor

[rxh]

Yesterday I made this adaptor for connecting a drill chuck to a brace to allow bits with round and hex shafts to be driven. The chuck came from a burnt out electric drill and is threaded 3/8” x 24 TPI UNF.
I have tried it out as follows;
- ¾” “wood “ twist drill in iroko,
- 15/32” “metal” twist drill in ¼” thick bright mild steel,
- 76 mm holesaw in melamine faced chipboard,
- 38 mm holesaw in hornbeam,
- 30 mm Forstner bit in hornbeam.
All worked OK. The big holesaw required quite a lot of effort to turn it but I think it is much safer than using a hand-held electric drill where a sudden jam can cause wrist injury. I found that a very sharp bit was needed for drilling the steel.

 

[dannyr]

nice - put me down for a couple.
danny

 

[Bm101]

Crikey. That's smart! Are you patent pending? Just a thought. Maybe you should be.

 

[Dovetaildave]

"The big holesaw required quite a lot of effort to turn it"....just out of interest, ........and i am interested, what sweep on the wheelbrace is it in the photo ?

 

[toolsntat]

Great job Richard =D>

"The big holesaw required quite a lot of effort to turn it"....just out of interest, ........and i am interested, what sweep on the wheelbrace is it in the photo ?

I'd say a No78 10" :wink:
Andy

 

[rxh]

Thanks for all your comments. The brace is a 10" sweep Stanley No.78.

I made the adaptor from 1/2" round barstock. I turned a "waist"and then a taper at one end and drilled an 8.5 mm hole in the other end. Then I filed the taper to a square section and tapped the thread. Before I make any more I want to devise a way of forming the square section without the effort of filing.

 

[AndyT]

Before I make any more I want to devise a way of forming the square section without the effort of filing.

I can think of another way to get the square taper, but a forge, bellows, anvil, tongs and selection of hammers would take up more workshop space than a file...

Good excuse though, if you want to get into hot metalwork.

 

[MikeG.]

What a good idea. It does make for a very long tool, though, which might limit its uses.

 

[Racers]

I had a thought that my SDS to chuck adaptor might work but I get a wobble using a long (300mm) drill but it did did grip.

Pete

 

[AES]

Brilliant idea very well executed rxh. Especially the file work. =D> =D> You can put me down for one too!

To go into "production" I guess the quickest & "cheapest" way would be to buy a mill. But I guess you know that already.

 

[Dovetaildave]

Someone was talking about shiny and nice to look at on another thread......I must admit to getting very carried away when it comes to the braces ( 14" recently acquired) and bits....especially the shiny shiny bits I've somehow acquired.

I'd be delighted to add a nice chuck to the collection.
P.S. Is it right that the extra length will help with getting it straight and true ?

 

[Wrongfoot]

Great idea! Put me down for one too...