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Chuck - Team Overkill - NSW
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Valen
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Key the teeth into the beater?
be a good use of yer mill ;->
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Post Thu Feb 15, 2007 9:40 pm 
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Knightrous
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quote:
Originally posted by DumHed:
just buy a CNC hacksaw Razz


I got one of those! Kinda sucks though, can't cut straight, needs to stop after each cut for a can of coke, refuses to cut 20mm steel... Laughing
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Post Thu Feb 15, 2007 9:52 pm 
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Nick
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Progress:

The beater has FINALLY been cut by DC waterjet and sent for machining - only two months late Rolling Eyes! Now the weapon is progressing, its time to get the Ti sides and covers cut; if there is any spare material I will get an option rear wedge cut to ward off the new breed of NSW vertical spinners - I know Jeff, Angus and Andrew are all looking for payback Laughing

I scored some spare Astro drive motors from Zac O'Donnell, of Tripolar fame http://jupiter.clarion.edu/~s_zrodonnell/index.html . Some of the motors are only good for parts but I need bits 'n pieces anyway. I should have six working motors once these have been serviced - enough to keep Chuck going for quite some time Very Happy.
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Post Tue Mar 27, 2007 6:51 pm 
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Nick
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CAD troubles:

I was finalising the CAD drawing for Chuck & Scissorhands when I found a big problem with the files I had been sending to the waterjet place for quotes. They couldn't read my Corel files so I send them exported Adobe Illustrator format. When I imported an Illustrator file into Rhino to check it, I found that there were several sets of parts stacked one over the other, so the waterjetter's costing software probably "saw" three times more parts to cut than I asked for - no wonder the last job cost so much! Evil or Very Mad This time I am finishing the parts in Rhino and submitting DXF files for the quote.

Some more progress with Chuck: I designed small front wheels to reduce drive friction. They are made from slices of a soft urethane tube with a thin bronze & steel bearing pressed into it. the wheel uses a shoulder screw for an axle:





The wheels are 9 by 27mm and feel like they are a little softer than a Colson. They are designed to roll during normal driving and compress during hits so the frame touches the floor and transmits all the stress. Now the only problem is cutting the tube into urethane donuts neatly.
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Post Fri Apr 27, 2007 11:57 pm 
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cerberus3112



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Make sure you do it slowly and keep checking as you cut. The damm roll likes to slide when you try to cut it fast. Smile
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Post Sat Apr 28, 2007 12:34 am 
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Nick
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The tube looks like it was guillotined from the marks on the end - I figure on either using a hand saw with a very fine blade or a box cutter blade. Either way, I will drill a 25mm hole in some thick MDF board and stuff the tube thru it to act as a holder / guide. It works out at around $2 per wheel, so I can afford to get a few wrong.

Just had a thought - this is exactly what the other guys were on about when they suggested adding an overhead mini-wheel for invertibility. Hmm, its got me thinking...
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Post Sat Apr 28, 2007 1:23 am 
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cerberus3112



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Sweet cheap and easy my favourite kind. Laughing
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Post Sat Apr 28, 2007 1:56 am 
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dyrodium
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Holeh sh*t so they cut you three beaters and tonnes of undercutter teeth!? Shocked

Regarding the uthrene, my bet would be a really fine blade, like a small fine blade on a band saw or maybe even a scroll saw. Razz
Looks funky, where did you get it?
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Last edited by dyrodium on Sat Apr 28, 2007 10:48 am; edited 1 time in total

Post Sat Apr 28, 2007 10:35 am 
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Knightrous
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quote:
Holeh shit so they cut you three beaters and tonnes of undercutter teeth!?


Nah, I would say the program put 3 sets of them in the same place, so the waterjet program would think it would have to go over the same place 3x .... WJ paces usually charge by the cutting distance IIRC, so instead of being the normal cutting distance, Nick was falsely sending them 3x the cutting distance Laughing
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Post Sat Apr 28, 2007 10:39 am 
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Nick
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@ Angus, Nah, this was for Ti cutting some time back - the parts were all layered so that if you just glanced at the file, it would look like one part. Once I started selecting things, I could see the duplicates; it's likely that the costing programs used at the waterjet place will calculate the total line length and multiply by thickness to get a cost. It's likely the program would have seen each layer and added up the $$$, while the actual cutting machine would have just cut around the part once - its not a mistake I will be making again!

EDIT: Like Aaron said Laughing
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Post Sat Apr 28, 2007 10:44 am 
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Fish_in_a_Barrel



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I might suggest a scalpel blade for cutting.

Post Sat Apr 28, 2007 10:51 am 
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Nick
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Box cutter = scapel for terrorists Laughing I agree, the thinnest possible blade will be best and a box cutter has more reach - I will be experimenting later today.
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Post Sat Apr 28, 2007 11:03 am 
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cerberus3112



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See if jolt can cut it. Laughing
Just change the TI teeth to a blade and drop the pipe in front of it. Laughing
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Post Sat Apr 28, 2007 11:12 am 
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Nick
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The guide wheels are all made, plus plenty of spares:



I made a very simple guillotine with two blocks of MDF spaced slightly apart so a boxcutter could slice thru the tube - It worked quite neatly and I still have more tube for spares if required.
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Post Sat Apr 28, 2007 11:14 pm 
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