This is a multi-part message in MIME format. ------=_NextPart_000_024B_01C23231.D2045200 Content-Type: text/plain; charset="iso-8859-1" Content-Transfer-Encoding: 7bit -----BEGIN PGP SIGNED MESSAGE----- Hash: SHA1 > I'm with you, this removes the need for top feed > solenoids as the wheel acts as a feed cam to only let > the chip feed when the wheel is in the right position. > It will be fiddly and require wheel cam profiling > to get the feed just right. I don't think it would. Just round your edges a bit :) If a second chip falls in a little, it will just get pushed back up. > > The crusher is a non-moving or sprung component. The PIC moves > > past it, which squishes the pins against the wheel. The wheel > > stops at the crusher position while the PIC is programmed. > > This is where the wheel idea has problems. The crush > pressure is quite considerable, +4kg from the side, but > to push the chip into a v-shaped groove to crush is still > over 3kg measured by my crude test. Assuming your wheel > is 2 inch radius this is 7lbs @ 2 inches, give it 100% > overhead for stepper reliability and you get 28 lb @ 1 > inch or 448 oz/in stepper motor needed. You will need > gearing on the stepper, probably about 10:1 even with > a larger stepper. Using rubber rollers on the side of > the main wheel reduces this by maybe half, but still > requires a large stepper with gearing, ie toothed belt > + 2 pulleys. You may be quite right on this one, but it's worth a closer look, I think. > Next for programming, the wheel system is much harder > to clamp the pins onto the PIC pins, considering it > has to rotate. The obvious solution is to have a motor > driven clamp, but if you have a motor driven clamp you > really don't need the wheel. :o) Once again, I think you've missed something. I was suggesting again that you use the .1" edge connector as the crusher. Place an opto sensor near the wheel, and stop it when the slot gets to the crusher point, where programming will occur. > > The wheel, having > > completed the PIC programming phase, rotates more, to the > > opposite gravitational polarity, as it were, and dumps the PIC > > out into a bin or tube. > > Yep, with the wheel you can eliminate the bottom gate > and have auto dumping. BUT the linear feed system is > much better if you want to feed the chips back into > a chip tube. :o) All you need is a funnel-like device on the output. It's not that hard to build. You just need a strip of metal around the wheel with gaps in it to hold the PIC in place when it's not falling in or out. > But you need a large precise wheel, quite hard to make > with 4 precise PIC slots that have to feed and position > perfectly. Easier with just one PIC slot per wheel, > you only have to fiddle with one profile. But you still > need stepper gearing, with pulleys and belts, etc to > give necessary torque. That's just the point. Only the diameter and the crusher/programmer mount need to be at all precise. Use optosensors to detect position, then who cares where the slots are? > The thing that really puts me off the wheel is that you > need to make one wheel for each chip size you do, ie > 8,14,18,28 pins etc, where the linear feed design will > feed any chip in that width, and doesn't need stepper > driver or stepper positioning, just "open gate and chip > falls in". Use rubber shims that fit in the bottom of the slot. You want a piece of rubber down there anyways, since you don't want the chip falling in hard. 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