Sharpening your own chipper blades

[treequip]

Nether thought of buying a second set?

 

Or for that matter reading the entire thread:laugh1:

 

 

 

It costs me £4 per set of blades at a company 5 miles away who specialize in sharpening machine knives for recycling plants, no postage etc. i have 4 sets for each machine and i try take as many as i can.

[cornish wood burner]

Yes - an inverter will permit the full use of three phase machinery as long as the 3ph motor can be wired in Delta(most can - connection info usually underneath the connection box lid). The motor then runs in 220-240v 3 ph rather than 415-440v 3ph.

These inverters are brilliant - you can get a soft start, seamless speed control from 0rpm to (usually) twice the original max speed, easy reverse etc. etc.

Some 3 phase motors run 415v or 680v. Not the most common but they are out there. Check for it on the motor plate.

[WoodED]

Or for that matter reading the entire thread:laugh1:

 

 

Takes too long, 👍🏼

[lewisyounger16]

Thought I'd chip in here. I used to work as a maintenance engineer, I was there machinist. I used to mill, turn and surface grind.

 

We had Jones and shipman 540 grinders, nice bits of kit.

 

I did a set of tw125 blades for a friend. I used the magnetic table and a magnetic angle table, or a sine chuck if you like terminology. You set them up using slip guage and a sine chart to attain the correct angle. Then clean the table so no grit will change the angle and clean the gunk off the blades and support them. Then dress the wheel and touch off and keep taking passes until they have cleaned up and you have a even shiny smooth ground surface all across the blade. I picked a 60 grit wheel and took .01" to .02" cuts with coolant to keep the temp down not to change the temper.

 

What it produced was flat ground razor sharp blades done in 20 minutes including set up and a bit of stropping with some wood to remove the burr. I wasn't sure how to hollow grind but I'm sure it can be done. Ill attach a video once it's uploaded.

 

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[lewisyounger16]

 

 

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Edited January 1, 2016 by lewisyounger16

[Breezeblock]

 

 

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to hollow grind you would have turned the blade the other way on your grinder 90deg to the axis off the grinding wheel

[lewisyounger16]

Would be tricky to do both at the same time though. Could set a zero and work to it it guess. Might achieve the same results.

 

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[karl]

i actually bit the bullet and ordered a new grinder , mvm bm 850. Saturn are dealing them and they have been very helpful on the whole thing

[tractorboy1]

wood chipper blade sharpener Ideal For Timberwolf And Planner Blades | eBay

[doobin]

Bodging of the highest order, but good results. I’ll order some ceramic roloc discs (I quite like the ‘feel’ of the roloc backing pad compared to a grinding wheel) and also knock up an mdf honing wheel for it. But good results in under a minute. 
 

yes I know all about grinding dust in the ways, but the mill is there to save me time, it’s fairly well protected and I’ll clean it.