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solid carbide spade? bit for drilling spring steel saw blade

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pgrbff22/01/2022 18:07:34
249 forum posts
31 photos

I need to drill some small holes, 3/16", in a spring steel woodworking saw blade.

I have read that there exists a solid carbide spade bit that is designed for drilling very thin spring steel that won't "grab" as it exits the back.

Has anyone seen such a thing?

Pete Rimmer22/01/2022 18:19:35
1219 forum posts
63 photos

You can drill it with a masonry bit 4.5/5mm but without the hammer action. I did this to drill the holes in a power hacksaw blade to mount it in a normal hacksaw frame for cutting vee way relief slots.

 

Edited By Pete Rimmer on 22/01/2022 18:44:29

Dave Halford22/01/2022 18:27:47
2004 forum posts
23 photos

Spade bits are more for drilling glass.

Any carbide twist drill will do

Vic22/01/2022 18:38:00
3060 forum posts
8 photos

I’ve used spade type glass drills for opening up holes in hard steel. Very slow but it did the job. I’m not sure you’d be able to start a hole with one easily though?

RobCox22/01/2022 18:54:57
59 forum posts
20 photos

What about using the old machinist's trick of putting a small piece of rag over the end of the drill whilst drilling. It certainly works for larger drills, say 6mm, but I've never tried it on anything as small as 3mm.

bernard towers22/01/2022 19:07:50
568 forum posts
109 photos

3/16 ball ended carbide mill for me

 

Edited By bernard towers on 22/01/2022 19:08:23

old mart22/01/2022 19:08:41
3717 forum posts
233 photos

If you have the means to sharpen the tip of a masonary drill to use for a cheap alternative to solid carbide twist drills, then try it. Otherwise Bosch do sets of multipurpose drills, like these sets from Screwfix.

**LINK**

not done it yet22/01/2022 20:46:17
6719 forum posts
20 photos

Clamp the blade between sacrificial layers - the bottom being a hard material, to support the blade and and slow the drill progress.

old mart22/01/2022 20:55:32
3717 forum posts
233 photos

There are always new ways of doing something, I have a power hacksaw blade and had never thought of drilling extra holes in it to use it in a 12" hacksaw. wink

noel shelley22/01/2022 21:37:17
1278 forum posts
21 photos

Bandsaw blades into hacksaw blades - an old trick - regrind a masonery bit to a cutting edge as a normal drill bit to make the holes. Noel

pgrbff24/01/2022 08:27:19
249 forum posts
31 photos

The spade bit seems to work extremely well. Very quick and without distorting the thin plate.

Here is an image, someone must have seen one before?

carbide-spade-drill.jpg

The handsaw is very thin, and a new one, I have had mine since the 80's, would cost over £155.

It would be nice to get it right first time. I always seem to distort thin plate when I drill it, even with a quality cobalt plate.

pgk pgk24/01/2022 09:17:26
2549 forum posts
293 photos

We had spade ends on thin wires for attaching bone fragments but on larger diameters such as 3/16th the pin end would be sharpened on three sides

this
https://www.kellmed.co.uk/wp-content/uploads/2015/02/305.175s-IMG_0096-steinmann-pin.jpg

Swarf, Mostly!24/01/2022 09:30:51
643 forum posts
70 photos

I thought the recommended method for making holes in spring steel was to use a punch and die??

Best regards,

Swarf, Mostly!

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