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new
29/07/2019 at 19:46
1

Deeemm – So refreshing to have you on this thread! Very articulate – love it. Two questions I have for you.

A) Can you explain the difference between a shredder and a granulator?
B) Wondering if there is an advantage for the hex axle rather than square. I have been thinking about using ‘disc harrow bearings’ which would allow me to easily source a cheap square bar. Plus squares are easy to cut with a torch. 😉

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new
15/12/2018 at 02:42
2

btmetz – I like those photos – and I think using spring steel is a great idea for the rest of the world. Dont have a laser cutter, just a torch and a drill press?  Even auto/truck axels are decent, because they have splined ends. Splined ends could be mated to pulleys, or at least ground down to a specific profile, using the splines as a guide. This is what I read recently to make me think – I likey…

“Truck and Auto Axels have been a favorite for making hardies and hammers as they are one of the largest pieces of forged steel on an automobile. Note that the flange on some axels is the perfect shape for a mushroom stake with a little work. The splined end has been used for texturing. “

Grind them down for the blade, and maybe even use them as the axle of the shredder? My first world mind still loves the idea of using carbide though…

new
07/12/2018 at 00:19
4

Standardization can be your friend! Three questions:

a) I noticed your ‘hardened’ teeth are an hourglass shape, so I assume your thinking of getting four sharp sides out of that tooth before you have to replace it with a new one? Great idea, but why not use standard carbide inserts? Finding someone to cut, then harden, those hourglass teeth is going to be frustrating for a lot of people.

b) The linear actuator is an interesting idea, are you referencing the auger feeder design used in a production granulators? if you haven’t seen them, you should search it. Feeding material in, is a proven industrial method. Bravo on that direction and good luck in keeping that simple and consistent. I look forward to that development!

c) Why is a hex bar still being used? A standard round axle with a keyway is not strong enough? That hex bar is strong, but requires machining to mate with a bearing or pulley. Machining in general – is a huge barrier to entry.  Just sayin’…even a square bar would be more readily available to more people.

Nice to see thoughts from other people on this machine! Thanks for the update!

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