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square holes?

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akean1 Remember To Love

1,088 posts · joined Dec 2004 ·

#319871
im trying to fit a towel rail bumper on to super bumper brackets. i need to have square holes for the bumper bolts.
any ideas on where to buy square drill bits?:duh
or how to make square holes in the bumper, they will be re chromed in the future, so im not to fussed about heat marks etc.

HotRodMatt If it\'s old or rare - cut it!

3,616 posts · joined Sep 2002 ·

#319896
Drill a small hole and get cracking with a small die grinder?

I think you will find they were punched from the factory. Unless you have a substantial hydraulic press and a good square punch the die grinder will be your best bet.

Chewy Fahrvergnugen

889 posts · joined Jul 2004 ·

#319899
Or use a drill bit slightly smaller than the width of the square and file the rest out with a square file.
.

Bizarre Moderator The artist formerly known as blue74l

12,787 posts · joined Aug 2002 ·

#319903
you can buy square hole punches.

Drill hole - put bolt through - do up and it "pulls" a square cutting bit through into a "block" on the other side.

Use to use them when i made switchboards
Futue te ipsum!!!

StenGuns Veteran Volks Folk

2,147 posts · joined Mar 2004 ·

#319904
Mate.. I found that number for the chroming..
Modern Plating, Oakleigh Vic, 03 9568 4588 ask for Jimmy or Harry.. Very good work
Rob
akean1 wrote:im trying to fit a towel rail bumper on to super bumper brackets. i need to have square holes for the bumper bolts.
any ideas on where to buy square drill bits?:duh
or how to make square holes in the bumper, they will be re chromed in the future, so im not to fussed about heat marks etc.

Andy Andy\'s Adventures

2,820 posts · joined Nov 2002 ·

#319907
Square file the way to go! Pre-drill first.

Dare I ask what your up to?

akean1 Remember To Love

1,088 posts · joined Dec 2004 ·

#319916
thanks stenguns.
what sort of places would sell those pullthrough punch's?
andy, im going hybrid 50's to 70's😉

Andy Andy\'s Adventures

2,820 posts · joined Nov 2002 ·

#319936
You'll have to post some pics when done 🙂

Bizarre Moderator The artist formerly known as blue74l

12,787 posts · joined Aug 2002 ·

#320013
akean1 wrote:what sort of places would sell those pullthrough punch's?
not too sure - engineering type places ..... Blackwoods???

here is one link

http://www.eastwoodco.com/shopping/product/detailmain.jsp?itemType=PRODUCT&RS=1&itemID=1492&keyword=28056

and here

http://www.classicsandcustoms.com/eastwood/categories/111.asp

Think it is the same one though

Might be too big as well
there is a great tool shop at Granville here
I will see if i can find there buisness card / web site
If anyone sells itthey will

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Futue te ipsum!!!

Stanley I guess the reward is in the doing of it

4,523 posts · joined Mar 2003 ·

#320066
Or alot of engineering or sheet metal places have large hole punch machines,
They usually have all sorts of dies..where I used to work years ago we had a machine for doing such things...amazing the thickness of sheet the can pinch through.
Obviously this will cost folding stuff.