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flying belgian

Well-known Member
I have to make a new spinner disk for the fert. spreader I just bought. It is 24" dia. and dished down in the center like a disk blade. It is dished to give it strength I assume but that also gives the product some lift so it can achieve the 55 ft. spread width listed on the rate chart. The original spinner was made out of 10 ga. but I have no 10 ga. so I will use a piece of 14 ga. I have around here and depress the center more so as to give it enough strength. The original is depressed 5/8 inch. Question---if I depress my new one an inch and half will that change the lift so much that it is noticeably wider spread width then 55 ft?. Logic tells me there will be some difference but in the whole picture will the difference be enough to be a problem? Thanks.
 
I think the width of the spreader is mostly dependent on the velocity that the materual leaves the disc, which will be governed by the speed of the disc.

If you increase the depression of the disc, it might result in "bunching" of material and produce an uneven spread.

The 14 gauge material might flex too much and also produce an uneven pattern.

My approach would be to duplicate the original disc as close as possible to arrive at the same spreader pattern as the unit had originally.
 
It would be necessary to know the speed of the spinning disk to do any sort of calculation, and it would still be an estimate at best. I don't think it would make much difference. Understand that when the pellet leaves the disk, it's not traveling radially from the disk center, but rather tangentially from the disk edge. I'd expect any vertical velocity a pellet picks up from the curvature of the disk to be small compared to its horizontal velocity.
 
I would use a disk blade It might be near free if used. the cup will affect the pattern some but in my opinion not enough to make a difference. If it does seem to change, run some material through it, and do a study of the pattern to assure of consistent and carefully lapped application. A disk blade will be strong and balanced well. Jim
 
I think approx. 150% increase in vertical velocity may make a significant change in the distribution pattern, as I expect it will not throw as far, all other variables remaining unchanged. However, I may be wrong. Testing the two disc profiles will provide the most accurate answer.
 
Not going to matter, might even work against you.. I think you will find speed to be the big factor in width of spread and at 55 ft you are pushing the width of any single disk spreader. If the material is real fine you want be able to get 55 ft.
 
The spinner may hold some more that would be noticed on the startup but speed and diameter would affect the distance. More water would stand in it but small holes would solve that. The angle of your paddles would have some effect also.
 
Way not just get the correct disc and be sure you getting it on right. why save a buck and waste hundreds by not getting it on right
 
the tangential velocity = 2 pi r/t--it would be the same if both discs operate the same rpm. with a deeper concave i would think that the resistive forces would increase and not spread as far--i would stick with the 5/8 or 3/4 dish
 
5/8 inch will only be 3 degrees. 1.5 inch will be just 7 degrees. I seriously don't think that will be enough to even detect a difference.

Using a thinner metal, you may see the disk flatten out depending on the RPM's.

If it spreads it out too much, just position it closer to the ground. Try it and report back.
 

Is it 3PT or trailer with ground drive? You can get very accurate with ground drive but for 3pt the variables of ground speed, PTO speed, and height will just wash away any little difference in the concavity.
 
If this is for a pull type spreader, they are not as expensive as you might think, to just buy a new one.
Ours has the shaft made as a unit to the disc. So it was not really practical to try what you are.
Fertilizer Dealer Supply in MI can help you out here.
 
His rate is dependent on the gate size and shouldn't be affected by the spinner. If it is possible, see if you can find a way to adjust the spinner position. Changing where the material drops onto the spinner greatly changes the pattern.
 
Unless you can't buy the part... I think I'd just buy it rather than screw around with it. That said... I don't think the depth of the center depression will make any real difference. THe variation of accuracy of those things is so wide to begin with that this would be a minor variable in the wider picture. If you're not setting it according to height, speed, gate opening and pitch and actually catching the product on the ground in trays to know where it fell... you're only stabbing in the dark anyway. Do what you're gonna do and don't worry about it.

Rod
 
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