drilling through hacksaws

[jimmy shoes]

they recommended 3 drills



DCST-3.20 Carbide Stub Drill @ £2.86

DCSF-1/8” (3.175) Carbide Straight Flute Drill @ £6.28

DCSPADE-1/8” Carbide Spade Drill @ £7.53

 

[jimmy shoes]

how long does a 1st class delivery take?

 

[Wozzaaah]

It's supposed to be 1-2 days I believe.

 

[jimmy shoes]

just had them, they look nice, i'll give them a go after

 

[jugs]

14/08/2008

Depends on what type of hacksaw blade you are drilling + how many holes.

If they are carbon use a Stub Length Carbide or cobalt drill,

If they are HSS (high speed steel) use Stellite. If you've only got few to do a Stub Length Carbide Drill might just do it.

With both options you need a rigid setup with everything bolted down cos you need high speed + high HP. DONT use coolant on Stellite.

Use stub drills as they are much more rigid than std length drills.

For supplys follow English Steve's link, contact them tell them what you want to do they will advise

Yes - For supplys follow English Steve's link, contact them tell them what you want to do they will advise the best method.

DONT buy cheap, its more expensive in time & cash. (eg: cheap drill machines from Screwfix )

thats not a full list give em a buzz to get the right thing for you.

I've dealt with them on a few occassions, they've always been very helpfull

Are these the drills recommended by DRILL SERVICE ?

What advice did they give you ?

How are you drilling the holes ?

What speeds & feed did they recomend ?

What dia are the holes ?

How are you clamping the work ?

This is the set that i bought

http://www.axminster.co.uk/product.asp?pf_id=20324&name=cobalt+drill&user_search=1&sfile=1&jump=0

unfortunately i cant find a drill vice that fits the platform so I'm doing it the DIY way, i bolted down a hefty piece of wood to the platform and clamped the hacksaw to the wood via small G-clamps, the holds will be 3.2mm, but im planning on drilling to that diameter in stages e.g 3.0mm then 3.2mm, I've gone for full speed (think it's 2500)

Jimmy, please phone the guys @ DRILL SERVICE they ARE the experts and will give you all the help you need, it will be quicker & cheaper in the long run ! Axminster are a good bunch but they are wood work tool suppliers.

2500rpm is far too fast, that's the speed for a stellite drill (aprox £25 for 3.2mm & will cut 100s of holes) I would take a rough guess @ 600rpm for Cobalt but expect a lot of broken drills.

Also - Look at Andyp's idea- "Why not drill bandsaw blade instead,"

PS Also try J&L Technical 0800 663355 for recomends.

12/09/2008

they recommended 3 drills

DCST-3.20 Carbide Stub Drill @ £2.86

DCSF-1/8” (3.175) Carbide Straight Flute Drill @ £6.28

DCSPADE-1/8” Carbide Spade Drill @ £7.53

Dont like to say "I told you so" but....
At least you got there in the end

Tell us how you get on.
regards

 

[jimmy shoes]

yes you were right lol

although a temporary setback in that it broke my hacksaw blade, a clean cut all way down the middle, guess i should have went a bit more easy on it

it did start to cut though right before it snapped it

 

[jugs]

Try lower feed rate. have you got some backing wood under the blade to stop the drill snatching.

 

[jimmy shoes]

yeah, my set-up so 'cos i cant find a drill vice to fit the table is:

piece of wood bolted to the table, then i sandwich the hacksaw blade with to pieces of aluminium, the top piece had a drill hole for guiding then clamped down with a small g-clamp, BUT this time i forgot to put the bottom piece of aluminium in

what do you mean by feed rate?

 

[jugs]

The feed rate is the rate at which you push the drill through, often expressed as so many thou per rev. So each drill and material combination have an ideal rotational cutting speed, + a feed rate.
eg a feed rate of 2thou means that for every revolution of the drill, it enters the work 2thou, removing a piece of swarf 2thou thick.

If you take too heavy a cut, particularly in thin material, the drill is likely to snatch as it breaks through. If you take too light a cut, you end up not cutting, just rubbing and causing friction, which can damage both work and drill. (With HSS drills, you can burn off the tip of the drill, transferring it by friction welding to the work, it's a bugger).

Phew!! Hope that helps!

 

[jimmy shoes]

yeah thanks

 

[asennad]

Are you making lock picks?

Need the holes to fit a motorized lock pick or handle?

 

[katluke]

Are you making knifes ? Once you have drilled the hole for the handle then shaped the blade you will re temper it.I came across a site a while ago were they were using hacksaw blades to make some impressive knives.

 

[graffian]

I tried drilling holes in a 24 inch hacksaw blade, bloke that gave me the blades
was cutting them down to fit his hacksaw[he bought hundreds of them for a few quid on ebay], he was using an edm to drill and cut them. I tried with a carbide drill and couldn't get through without cracking the blade.

 

[jimmy shoes]

how much pressure did you apply, when i was drilling through the blades i used light pressure

 

[brightspark]

What I used to do was to take a masonary drill (which is quite cheap) of the right diameter and grind its edge to a shape close to regular metall drill ( you need a special grinding wheel for this material (its green) and then you can drill it.

thats what i do with the large 14 inch power hacksaw blades get the large ones for a quid each .the trick is spot heat the blade where u want the hole and drill while still red hot it goes through like butter the drills are only 80 pence from screwfix