[ErikH] sent in this sweet little device that he and a studymate put together from some spare parts to measure and cut strips of SMD resistors for one of their student organizations. The stepper motor and LCD were salvaged from a printer, an ATMega8 drives it, and a servo drives the cutting mechanism. The video’s not very exciting, but it shows a decent demo of the device.
Wow, I’d love to see plans made for this. I take it that it’s just using the length to make the cuts?
Posted at 1:22 am on Jan 31st, 2008 by Brian Archer
Alan, the cutter is made using a standard blade from a ’stanley’knife. It’s pretty strong and has two usable edges. It is bolted on an aluminium strip that is held by a small bearing so it can rotate up and down. A small RC-toy servo is used to push it up and down.
Brian, It uses the holes in the tape in between of the components. While the steppermotor drives the tape forward the holes go trough a IR led and photodetector (more old printer parts). The avr counts the amount of holes and cuts after the desired amount has passed the sensor.
Thnx for posting Will!
Posted at 4:53 am on Jan 31st, 2008 by ErikH
Um. Someone delete the spam please. SamuelGreen is doing some link farming.
Oh, and good hack.
Posted at 9:42 am on Jan 31st, 2008 by MacGyver
Spam’s cleaned.
Posted at 10:38 am on Jan 31st, 2008 by Will O\'Brien
alan, if you change your requirement to 512 equal lengths of wire, you can hand-cut them very quickly with divide and conquer.
Start with a very long wire, fold in half once. Take the two wires and fold them in half again. Keep folding another 7 times, and then cut the folds – many at a time – with heavy wire cutters.
But that’s definitely not as neat as a wire clipping robot, and the robot can easily deal with requirements changing. ie. unequal lenghts and numbers not close to a power of 2.
Posted at 1:59 pm on Jan 31st, 2008 by BillW
Heh, I expected this was from the student organisations store I buy my stuff when I remembered someone telling me they were going to sell SMD stuff, and when I saw the typical red table, I knew for sure. Gratz, nice hack, shows what one can do with a little inventivity, some ICs and a spare printer. I’ll be sure to see this on IRL soon.
Hey Jeroen!
Indeed, thats the one ;) Most of the credits go to RobR for this device, I just helped building the mechanics.
Your Flux arrived yesterday, so it’s ready to be picked up from monday the 4th. See you there!
Posted at 7:02 pm on Jan 31st, 2008 by ErikH
I would suggest using a rotary solenoid and relay to actuate the knife. This could speed up the system dramatically while only sacrificing power consumption.
Posted at 12:15 am on Feb 1st, 2008 by Andrew Hillenius
What are these strips used for?
Posted at 2:06 am on Feb 1st, 2008 by frenchie
@ frenchie
The strips have small surface mount components on them, just the same way through-hole resistors sometimes come on long strips of paper.
Excellent hack, I suspected that it was optical, but my be was on “black” detection of the actual SMD’s, I didn’t realize there was a hole (duh).
Posted at 4:50 am on Feb 1st, 2008 by Miles
is anyone but me creeped out by the way the strip feeds the wrong way?
(I know it’s actually just the framerate, but still my brain has problems)
Great hack! (I need to take a closer look at that cutter mechanism, it looks perfect for a need of mine!)
Posted at 8:36 am on Feb 4th, 2008 by srilyk
nice one
Posted at 11:01 pm on Oct 24th, 2008 by 1
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What a great idea! I have been thinking of making something similar (not as high tech though) for cutting lengths of wire from a large spool when making stair lights.
http://alan-parekh.vstore.ca/index.php/cPath/1_2
I would love to be able to set it to cut 500 equal lengths of wire and go and watch a movie! Instead I come away with blisters. :(
Any details on the servo cutting mechanism? Looks to have some very good mechanical advantage…
Posted at 12:54 am on Jan 31st, 2008 by Alan