Wood chipper - video

[Jon]

Wood chipper. By Diamleon Diy Builds. 14:35 video:

Previously:

Metal bender - video
Lathe from angle grinder - video
Tube notcher - video
No-weld metal bender - video
Stump remover from angle grinder - video
No-weld metal drill press vise - video
Sheetmetal brake - video
Hydraulic vise - video
Roller bender - video
Metal bender - video
Drill-powered air compressor - video
Metal roller bender - video
Homemade wood chipper from angle grinder - video
Car jack vise - videos
Homemade air compressor - video

[nova_robotics]

That thing scares the poop out of me. The fasteners aren't captive. Run that for 15 seconds and the bolts are going to back off. That's when you catch one of those sharpened blades in the forehead.

[Daturat100r]

Helluva dangerous it will smash itself to pieces with failure to chip limit as well as what Nova pointed out. Industrial chippers use and anvil and blade that cuts all but flush with anvil so the feed controls the chip size.This thing, before it spits its blades out will grab a huge bite and drag the wood at a speed close to or equal to knife tip speed.Terrifying really would not want to be anywhere near it

[schuylergrace]

All the extra effort to cut slots in the blade blanks, when they would have been much safer and just as easy to install with the original clearance holes for the attachment screws. And I'd also put thread locker on the bolt threads and safety wire them to make sure they don't back out. Just one of those bolts could put a serious hurting on a fellow if it came flying out. At least a blade coming off would require failure or loosening of three bolts. I'm assuming, at this point, the feed issues have been worked out, but we'll see in the next installment.

[NortonDommi]

Common in Much of Europe. https://remetcnc.cz/141-rezaci-mechanismus/ is just one manufacturer. If you want to make one that works better here is a Rebak Wolcowy from your own hands: https://chertegnik.ru/oborudovanie/5...chertezhi.html
If you plug Rebak walcowey into YouTube you will see everything from professionally manufactured to barely together grenades waiting to go off.
The types of burners used demand smaller pieces. These things process wood very fast but regardless of the diameter of the cutting circle chip length varies depending on wood diameter.

[firefighter machinist]

What kind of cut-off wheel are you using on your angle grinder? It's very impressive!

[Elizabeth Greene]

This thing, before it spits its blades out will grab a huge bite and drag the wood at a speed close to or equal to knife tip speed.

The comparable one NortonDommi linked to runs at 540rpm. Assuming that the diameter of the rotor is 3 inches that puts the knife tip speed at 20 feet per second* or 13 miles per hour. A broomstick shoved through it and shot out at that speed It would certainly hurt, but it's not likely to fly very far.

* Double-check that math: 3 inch diameter squared is 9 times 3 (pi) = 27 inches per rotation * 540 rpm = 14580 inches per minute /60 = 243 inches per second /12 = 20.25 feet per second * (3600 seconds per hour/5280 feet per mile) = 13.8 miles per hour.

As it's feeding wood through the blade is being shoved back onto the bolts, so for knife ejection to happen it would have to snap all three of the retaining bolts. I don't know enough engineering to know if that's a likely failure scenario, but for scale the single shear strength of a grade 8 1/2" bolt through 1/2" material is a several tons. Your scenario of it grabbing the wood and pulling through seems more likely, but it would require all of the blades to be too loose to cut through the material at the bottom of the cutting cycle. This seems like it would get more likely over time as the middle of the blades started to wear.

Here's hoping they put an E-stop bar on the feed-in. An arm stuck in that would be horrific.

[Elizabeth Greene]

He finished it, and it's every bit as terrifying as you could imagine. No E-stop, spinning terrifying fast, and yeeting out foot-long vampire killers out the back.

[nova_robotics]

He finished it, and it's every bit as terrifying as you could imagine. No E-stop, spinning terrifying fast, and yeeting out foot-long vampire killers out the back.

Can you submit a Youtube link as part of a coroner's report?

[schuylergrace]

To be fair, and e-stop would probably just prolong the agony. Might as well get sucked all the way in and get it over with.