Harder 750a discs

Doesn’t a high carbon steel that is 55 HRC become to brittle? I appreciate that high carbon tool steels can be even harder than this but as hardness increases so does its brittleness. It ought to be pointed out that the JD standard for these discs is some thirty pages long. I am under no illusion’s that I face a firing squad at dawn if I reveal it’s contents but I think it’s worth pointing out that hardness alone isn’t the only criteria important when manufacturing or buying these discs.
I could be wrong but aren't Vaderstad Disc's 55HRC? Are they brittle?
 

Simon Chiles

DD Moderator
I could be wrong but aren't Vaderstad Disc's 55HRC? Are they brittle?
They are 55HRC and I don’t think they are brittle. I doubt they are made from high carbon steel.
JD don’t make discs, they source them from several different manufacturers around the globe. There are two numbers on a JD disc and a logo. One number is the part number and the other tells you the manufacturer and steel quality amongst other things. The JD logo is only allowed to be used if it meets the JD standard. When I asked JD to supply 55HRC discs they came from a certain manufacturer direct to me, so I knew who made them. The following year Vaderstad launched their new hard wearing discs called the V55’s which I suspect is hardly a coincidence. Despite Vaderstad’s claims that these are made in Sweden I think they are made in Spain. Several years ago at an Agricultural Show I was standing next to a JD drill when an Indian Gentleman started to ask a JD salesman about the drill. ‘It’s no good asking me mate’ was the salesman’s reply ‘ it’s him you need to talk too.’
I asked him why he was interested in the drill, it was obvious that he wasn’t a farmer, and it transpired that he was a manufacturer of discs. When I said that they needed to be 55HRC he confirmed what I already knew and that was that there was only one manufacturer in the world that could make discs of that quality. When we finished the conversation he concluded that he needed to improve their manufacturing process so that they could compete on quality rather than having a race with the Chinese to see who could make the cheapest.
 
They are 55HRC and I don’t think they are brittle. I doubt they are made from high carbon steel.
JD don’t make discs, they source them from several different manufacturers around the globe. There are two numbers on a JD disc and a logo. One number is the part number and the other tells you the manufacturer and steel quality amongst other things. The JD logo is only allowed to be used if it meets the JD standard. When I asked JD to supply 55HRC discs they came from a certain manufacturer direct to me, so I knew who made them. The following year Vaderstad launched their new hard wearing discs called the V55’s which I suspect is hardly a coincidence. Despite Vaderstad’s claims that these are made in Sweden I think they are made in Spain. Several years ago at an Agricultural Show I was standing next to a JD drill when an Indian Gentleman started to ask a JD salesman about the drill. ‘It’s no good asking me mate’ was the salesman’s reply ‘ it’s him you need to talk too.’
I asked him why he was interested in the drill, it was obvious that he wasn’t a farmer, and it transpired that he was a manufacturer of discs. When I said that they needed to be 55HRC he confirmed what I already knew and that was that there was only one manufacturer in the world that could make discs of that quality. When we finished the conversation he concluded that he needed to improve their manufacturing process so that they could compete on quality rather than having a race with the Chinese to see who could make the cheapest.
Very interesting, your knowledge on the subject is fascinating!
I'm assuming that the Spanish company may be Bellota?
So you can tell me the manufacturer of these OEM discs?
1527237614195.jpg
 

Simon Chiles

DD Moderator
Very interesting, your knowledge on the subject is fascinating!
I'm assuming that the Spanish company may be Bellota?
So you can tell me the manufacturer of these OEM discs?View attachment 675090
No I can’t, that code is for a new manufacturer that they use since they sent me the standard. I can tell you that they’ll last ok, not as long as a 55HRC, but I’ve had a few sets of those. I can tell you they are made of Boron Steel.
 
No I can’t, that code is for a new manufacturer that they use since they sent me the standard. I can tell you that they’ll last ok, not as long as a 55HRC, but I’ve had a few sets of those. I can tell you they are made of Boron Steel.
They are Wearing ok so far.
Out of interest would you ever be tempted to use non OEM discs? Especially since the price difference seems to be growing at the moment
 

Hans B

New Member
Hello all, we have stock arriving in August of the JD disc with an 18mm bevel. Give us a shout on 01794 388622 if you want to put your name on any to trial. Glad of all the feedback we can get.
 

Fish

Member
Location
North yorkshire
image.jpeg
image.jpeg
Wet today, so just been tackling this job. First time we've done it, so abit of a learning curve as to find the easiest way to do it.
It took two of us about 3.5 hrs to change 24 discs, we have used jd discs as the last set drilled 2500 acres.
 

Tractor Boy

Member
Location
Suffolk
View attachment 703478 View attachment 703476 Wet today, so just been tackling this job. First time we've done it, so abit of a learning curve as to find the easiest way to do it.
It took two of us about 3.5 hrs to change 24 discs, we have used jd discs as the last set drilled 2500 acres.
How wide is your drill. My original set on a 4m did 1000acs and my second set, again jd did 850. Both sets worn down to 17” and bevel just about gone when changed.
 

Fish

Member
Location
North yorkshire
What do you use the battery impact wrench for?
Taking off the gauge wheel and seed firming wheel, air gun takes off the discs. One man on each, work from outside to centre, take off seed wheel and gauge wheel, then disc. Then re build from centre out, new disc, replace seed wheel then gauge wheel as you go.
 
Location
Cambridge
Third version of the 55RC APM discs have landed. Finally, they have matched the bevel on the OEMs. Still not quite as sharp, but I’d guess that very sharp edge is lost quickly anyway. Think I can do a fair comparison now anyway, changing the whole set before drilling starts this autumn.
5A3FE8A9-080F-4BFD-BB98-B5903541D200.jpeg
 

Clive

Staff Member
BASE UK Member
Location
Lichfield
Third version of the 55RC APM discs have landed. Finally, they have matched the bevel on the OEMs. Still not quite as sharp, but I’d guess that very sharp edge is lost quickly anyway. Think I can do a fair comparison now anyway, changing the whole set before drilling starts this autumn.View attachment 712944

what's the price difference of the correctly beveled ones vs OE then ?
 

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