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28/06/2016 at 13:36


I haven’t had any issues yet. Touch wood. Shafts are 50mm apart on their centerline. Everything is attached via set (grub) screws. It holds together well even using 10mm blades shredding aluminium cans. That’s the highest abuse I’ve put it through. I agree that it is too small for a 10mm bore.

If I redesign, 41mm hex and 32mm plate will be used via a 5hp 3phase. Prices skyrocket for that system though. I may just remake my shaft to 20mm and order new bearings to match.

I will have photos of mine in coming days. Here is a picture of Thymarks and my gearbox outline for reference.


28/06/2016 at 11:04

Mines a little different. I have 4 sets of blades for mine. 4,6,8,10 & 20mm. That’s 1/8, 1/4, 5/16, 3/8 & 3/4. Cost for mine was a hair under $800aud. I’ll write the price list below. Mines a modification of Thymark – Filamaker as its a stronger design in my opinion. Most of this has lots of excess due to minimum order sizes and using what I had first before buying anything.

Parts list:

2 x 17x335mm Extra long CRV Hex Key $78
5 x 6202 15x35x11 Bearing $20
2 x Drive Sprocket 50T 9.525 Pitch 06B
Chain (20mm bore required welding and machining to 10mm bore) $110
2 x Drive Sprocket 10t 9.525 Pitch 06B Chain (10mm bore) $8
1 x 3HP 2.2kw 1730RPM 4P Hyundai Motor $140
1 x 3m 06B Chain $26
100 x M4x20mm Hex Machine screw Black $13
2 x 20T Spur Gear 35mm 10mm Bore $41
1 x 4mm Hex Tungsten Tapered Tap $5
20 x M5x20mm Black Set Screw $9
20 x M4x20 Black Set Screw $-
1 x 35x30mm Annular Cutter $88
1 x 25x30mm Annular Cutter $55
1 x Pin 6mm for 30mm Annular Cutter $22

All steel was 4340 which was made from offcuts from my work. Electronics where free. Another few hundred for parts and labour. I’m very fortunate as this would have been hundreds of dollars.

It cost 2hrs labour @$60hr Machining and water jet. Water jet doesn’t ruin the factory heat treatment of 4340.

Mine assembles in just a few minutes including it’s 25:1 compound chain gearbox.


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