Author Topic: Anyone need any machining work done  (Read 2508 times)

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Offline SmAsH

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Re: Anyone need any machining work done
« Reply #1 on: May 07, 2009, 03:15:13 AM »
any more info on that? materials allowed? max/min size? machines you will use to cut them?
Howdy

Offline yobomenaceTopic starter

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Re: Anyone need any machining work done
« Reply #2 on: May 07, 2009, 04:14:49 AM »
pretty much any machineable material eg nylon, aluminium, mild steel, bronze, 4140, 4340, stainless etc.
sizes nothing bigger than 3 metres long, no bigger than 600mm diameter. pretty much if you have any machining requirements there's a pretty good chance i'll be able to do it.

Offline yobomenaceTopic starter

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Re: Anyone need any machining work done
« Reply #3 on: May 07, 2009, 04:21:02 AM »
lathe and milling machine

Offline Soeren

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Re: Anyone need any machining work done
« Reply #4 on: May 13, 2009, 06:04:53 PM »
Hi,

Do you use CNC?
What tolerances can you handle?  (in mm and in degrees)

In a stainless steel disk, say 1 mm thick, could you make a pattern with a guaranteed rotational tolerance of less than 0.1°
Something like this:

My current plan is to get a repro film made from my CAD drawings and then get it either photo- or LASER etched/engraved into stainless steel, but then it can only be made in foil, which mean I have to mount it on polycarbonate or similar to get the needed stiffness to make it self supportive - a single piece of stainless steel would mean less things to foul up in the wrong moment.
I'm just not sure I can get it made to the required tolerances unless I pay through my nose, while CAD->film-> etch/engrave will give me more precision than I need for a very modest price.
Regards,
Søren

A rather fast and fairly heavy robot with quite large wheels needs what? A lot of power?
Please remember...
Engineering is based on numbers - not adjectives

Offline yobomenaceTopic starter

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Re: Anyone need any machining work done
« Reply #5 on: May 16, 2009, 09:41:06 PM »
no sorry i don't have immeadiate access to cnc however i could ask around i know quite a few people that deal with cnc send me a drawing of what you want and i'll see what i can do for you

Offline arixrobotics

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Re: Anyone need any machining work done
« Reply #6 on: May 16, 2009, 11:08:17 PM »
are you based in Australia? coz your email is @optusnet.com.au...

Offline yobomenaceTopic starter

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Re: Anyone need any machining work done
« Reply #7 on: May 17, 2009, 12:09:18 AM »
yep, brisbane australia.

Offline madchimp

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Re: Anyone need any machining work done
« Reply #8 on: May 17, 2009, 03:50:31 AM »
Soeren you may have already thought of this and ruled it out but if you are useing it for an encoder and its not too large you might be able to just print it to transparancy if nothing else it's worth a try I've seen other people use transparency to make encoders and its cheaper and quicker than the alternatives course thats as long as you have access to a laser printer with enough resolution for what you need

Offline Soeren

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Re: Anyone need any machining work done
« Reply #9 on: May 24, 2009, 04:24:01 AM »
Hi there,

Soeren you may have already thought of this and ruled it out but if you are useing it for an encoder and its not too large you might be able to just print it to transparancy if nothing else it's worth a try
That is what I've been doing for years for stuff needing less accuracy, but it doesn't really gets all that perfect (try studying a print in a microscope - it looks like splatter paint). I mount it on a thin polycarbonate carrier to give it structural strength though.


I've seen other people use transparency to make encoders and its cheaper and quicker than the alternatives course thats as long as you have access to a laser printer with enough resolution for what you need
The coded disk in the photo above, I've made by printing to a piece of drafting "paper" (the matte film stuff) and used that to etch it onto a piece of PCB material (same method I use for making PCBs). The drafting paper takes the toner somewhat better than regular transparencies, but still have tolerances, just like the etching process itself has.
I use comms fibers mounted in a machined block of rigid plastic (don't know the type, just something I had handy) for reading it (from the foil side, with IR LEDs on the other side) to get the size down (this particular disk is around 4" in diameter :o) and the precision up, if anyone should be curious.

I can get an A4 size sheet run out on film from a repro firm, directly from my CAD files, with a hysterical perfection and it will cost me no more than around $10 ($20 tops), depending on how fast I need it (and several coded disks could be made in a single sheet).

I could use this film directly, or etch it onto copper clad board, but I'd like the strength of steel to make it last - besides, I really like Stainless Steel  ;D
I have yet to get a price on the foil etching though.

Thanks for your thoughts!
Regards,
Søren

A rather fast and fairly heavy robot with quite large wheels needs what? A lot of power?
Please remember...
Engineering is based on numbers - not adjectives

Offline Soeren

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Re: Anyone need any machining work done
« Reply #10 on: May 24, 2009, 04:28:30 AM »
Hi,

no sorry i don't have immeadiate access to cnc however i could ask around i know quite a few people that deal with cnc send me a drawing of what you want and i'll see what i can do for you
Thanks for the offer, but I'll check around locally first, as shipping in itself will cost an arm and a leg (I'm in Denmark, halfway around the earth from you). Presently it's not a high priority, since I have tonnes of other stuff waiting to be done (haven't we all ;)).

But thanks anyway!
Regards,
Søren

A rather fast and fairly heavy robot with quite large wheels needs what? A lot of power?
Please remember...
Engineering is based on numbers - not adjectives

 


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