what brand holesaws?

[shanky887614]

what brand holesaws do you guys use for 20,25,32,38 and 51mm steel?

we used to use ck but wholesalers only stock starret now and there terrible, burnt two 38mm out on less than 16 holes

 

[Geordie Spark]

what brand holesaws do you guys use for 20,25,32,38 and 51mm steel?

we used to use ck but wholesalers only stock starret now and there terrible, burnt two 38mm out on less than 16 holes

Quite a few of my engineering tools are Starret and they are top notch.

As for burning cutting tools out that is most likely due to using them incorrectly - too high a speed and/or too coarse a feed.

Most leccy drills run far too fast for holesaws and unskilled operators don't understand that the tool does not like being forced - let it take it's time to cut.

 

[telectrix]

what he said.also lubricating/cooling the blade makes them last longer.

 

[shanky887614]

not me burning them out lol, i was wondering what you guys used.

the muppet was using a 110v sds with an sds chuck so he could use holesaws in it.

at full speed so he burny his out then burnt the one in my bag out.

 

[Geordie Spark]

what he said.also lubricating/cooling the blade makes them last longer.

.. and if you're not happy with High Carbon Steel (£ cheap) or High Speed Steel blades (£ not so cheap) try Tungsten Carbide blades (£ getting pricey)..... after that you're getting into diamond tipped blades (£ you don't want to know!!)teritory .....

 

[telectrix]

coming from bandit territory, i would have thought you'd be able to spell territory.

 

[Geordie Spark]

coming from bandit territory, i would have thought you'd be able to spell territory.

I do, but my spell checker doesn't. We disagreed and decided to settle by ----ing a coin and I lost.


Clivvor shyte!!

 

[sammyshooter]

Cutting fluid/oil, even wd40 does it, just watch out for splatter and smoke...

 

[Geordie Spark]

what brand holesaws do you guys use for 20,25,32,38 and 51mm steel?

we used to use ck but wholesalers only stock starret now and there terrible, burnt two 38mm out on less than 16 holes

I've just trawled through my memory of 27 years in engineering as a machinist, machine shop foreman and training instructor and I can tell you that the correct speed for a 38mm (1.5") holesaw is 267 RPM - with coolant, so if your drill can't get down to that speed you are going to burn the cutter out sooner rather than later!

Here's the gen and it applies to ALL cutting operations whether in a machine shop or some bod with a Black & Decker.

The bit of the table which is most useful to you I have changed the text to red and you will see the speed for your 38mm (1.5 inches) cutter as being 267 RPM.

Quick RPM/Spindle Rate Calculations: Lathe, Mill, Drill (HSS Cutter)
(RPM changes with Cutting Speed & Diameter)

Material	1/4" Dia	1/2" Dia	1" Dia	1 1/2" Dia	2" Dia
Low-Carbon Steel	1600 RPM	800 RPM	400 RPM	267 RPM	200 RPM
High-Carbon Steel	960	480	240	160	120
Aluminum	4000	2000	1000	667	500
Brass & Bronze	3200	1600	800	533	400

* RPM Spindle Speed Examples calculated using Ballpark Cutting Speeds with High-Speed Steel cutting tools

Calculating RPM Lathes, Milling Machines, Drills RPM (Turning Spindle Speed) of the cutting tool or work piece is calculated as follows: RPM = (Cutting Speed x 4)/Diameter RPM = Spindle Speed Cutting Speed = Cutting Speed for the material being cut/worked. Diameter = The Diameter of whatever is turning. Example #1 Calculate RPM for turning a 1 inch diameter piece of Low-Carbon Steel with a Cutting Speed of 100 on a Lathe. (Double-check CS table) RPM = (100 x 4)/1 = 400 RPM Example #2 Calculate RPM (Spindle Speed) for a 1/2 inch High-Speed-Steel 2 Flute End-Mill cutting Aluminum with a CS of 250 on a Milling Machine RPM = (250 x 4)/.5 = 2000 RPM

 

[shanky887614]

like i said i didnt burn them out, the idiot that burnt 2 out because he was pushing on and using his sds on max speed.

i drill 6mm holes slower than he uses a holesaw.

and my 6mm bits have a small pilot tip

 

[Geordie Spark]

like i said i didnt burn them out, the idiot that burnt 2 out because he was pushing on and using his sds on max speed.

i drill 6mm holes slower than he uses a holesaw.

and my 6mm bits have a small pilot tip

Yep .... that would do it!

Edit:

From the table the correct RPM for your 6mm drill in steel is 1,600. WITH COOLANT!!

 

[shanky887614]

Yep .... that would do it!

Edit:

From the table the correct RPM for your 6mm drill in steel is 1,600. WITH COOLANT!!

i pllay a game with work mates by only carrying these bits

if they try to drill too fast or push on to hard on tray, trunking etc they make a mess lol


my drill has around a 2000rpm no load rpm so not hard but they do holesaws higher and wonder why they blunt quick.

honestly they use there drill instead of mine because it has a slightly higher rpm as well XD

 

[Guest77]

what brand holesaws do you guys use for 20,25,32,38 and 51mm steel?

we used to use ck but wholesalers only stock starret now and there terrible, burnt two 38mm out on less than 16 holes

The cheapest, none of them last long these days in any case, manufacturing is no longer quality as previous years, vertually all drills are made in china lol

 

[Geordie Spark]

The cheapest, none of them last long these days in any case, manufacturing is no longer quality as previous years, vertually all drills are made in china lol

Granddad was a Pattern Maker (think high quality woodwork here) and I have his tools which are over 100 years old and still hold their sharp edge. Steel of that quality is not made any more!

 

[shanky887614]

Granddad was a Pattern Maker (think high quality woodwork here) and I have his tools which are over 100 years old and still hold their sharp edge. Steel of that quality is not made any more!

i gave mike a straight and the quality of that carbon steel is a lot better than a lot of new products.

my oldest razor is from the late 1800's and is the best quality razor i own