Best metal to use for replacement drill blades

atkinsonp2

Member
Hi I have a old direct drill and the blades are worn. I can't seem to find replacements for them. I had some made last year but when I used it as soon as it hit anything remotely hard they bent could anyone tell me the best metal to use for making some new ones thanks. I'll put some pictures on when I get chance thanks.
 

atkinsonp2

Member
These are what happened to the new blades
1488800503883.jpg
 

clbarclay

Member
Location
Worcestershire
Looks an odd shape blade (edit, just realised thats a bent blade), what is the drill and what does the rest of the coulter look like?


Wear resistance steels (such as hardox) come in a range of yeild strengths. While they will resist abrasion better than typical fabrication steels, some are not much stronger to resist bending. Hardox for example you probably want a 500 or 600 version to ensure it new ones don't bend. Do you know what grade of steel the last lot were made from?
 

atkinsonp2

Member
I will ring the firm tomorrow I think they called it stainless steel wear plate. I'll get some photos of the machine in the morning.. my other idea was to get some standard drill discs and get the hole cut out would that work? Or would the disc lose its strength with the hole cur out?
 

Mursal

Member
Sorry I cant picture where that plate goes ..........
You might have to go stainless if the old ones are shiny.
Can you go heavier than the original to keep cost down?
If they are just bending there (as in picture) can you weld an angle across the weak point (the bend)
 

Mursal

Member
So the bent part in the original picture is the third blade, is it?
Heavier material if its bolted to a solid flange?
A previous post mentioned Hardox, if you can work with it and its within budget.
 
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atkinsonp2

Member
The blades I had made where made from stainless steel wear plate I have a suspicion that it maybe what they had in rather than what they should of been made of they where the same thickness but I have no idea about the strength of metal I have been to a laser metal cutting place today with a old blade and they are going to price making them with hardox and 600 grade let's hope I don't fall over when I get a price back
 

atkinsonp2

Member
So the bent part in the original picture is the third blade, is it?
Heavier material if its bolted to a solid flange?
A previous post mentioned Hardox, if you can work with it and its within budget.
Thanks I have asked for a price today for some new heavier grade and also in hardox let's see what the price comes back like
The blades I had made where made from stainless steel wear plate I have a suspicion that it maybe what they had in rather than what they should of been made of they where the same thickness but I have no idea about the strength of metal I have been to a laser metal cutting place today with a old blade and they are going to price making them with hardox and 600 grade let's hope I don't fall over when I get a price back
 

Dave W

Member
Location
chesterfield
It's called a sisis contravator. I think it's a early 80s machine I use it for over seeding horse paddocks it works really well believe it or not [emoji23]
Yes just worked that out. Sold one a few years ago.
Have you contacted sisis to see if tungsten tipped blades are available?
There's a firm in Sheffield who make blades for most of the groundcare firms. They made me so tungsten tipped flails for a scarifier. Incredibly hard wearing
 

atkinsonp2

Member
Yes just worked that out. Sold one a few years ago.
Have you contacted sisis to see if tungsten tipped blades are available?
There's a firm in Sheffield who make blades for most of the groundcare firms. They made me so tungsten tipped flails for a scarifier. Incredibly hard wearing
Yeah tried sisis they where no help at all sadly. I don't suppose you know the name of the firm you used do you?
 

atkinsonp2

Member
Up in sunny Cumbria so miles away from anywhere! I have contacted a firm called lakes laser today who seem very good hopefully better than the last firm I got them off
 

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