The Fryer

well this bites, my friend don't want to really help me, but has given me access to the shop after hours. so hopefully after i get this whole thing figured out i can begin working on it soon after. on a good note i can use all scraps, including the big stuff, so looks like that's a plus.

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ok i couldn't keep it there.. just to big..

The Fryer

well i started makeing the frame for it.. but as of now we are so low on work this thing is going to take for ever. i am saveing scraps from jobs to use, but only get so much.

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ok i couldn't keep it there.. just to big..

Slink

What a great thread. I like the idea.

I plan on opening a computer-and-network business soon (service and retail) and this sort of thing seems really enticing. If you were to start a lapping business, and I had my "extreme computing" department (or whatever I end up calling it) I'd send out CPU's and heat sinks to a practiced specialist such as yourself (assuming that by that time you'd be a practiced specialist, and that I wouldn't have the time to do them. ).

Whatever the case, in a shop setting, levelness can easily be monitored by (let's say) mounting a ZIF CPU socket in a long, flat board (wood or whatever material) so that the ZIF is centered perfectly and the board could balance on the CPU if it were set on a flat level surface, die side down, board on top of pins. On a level, flat table, I'd use the board to measure distance from the tabletop on extreme opposite sides.
I'd personally set up two mounted rulers that are vertically square (plumb) to the table, mounted at the same exact measurement from the table, and at the extreme opposite sides of wherever I'd set the CPU (die-side down, pins up, ZIF board on top). You like my idea?

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The Fryer

yeah that is an interasting idea, but when lapping you realy only want to use the weight of the cpu to do it. i actuly came up with the idea of slowing the "lapping part" down from around 220rpm to about 75-100rpm, the useing an old zif socket modified onto some sort of a handle so i know just how much pressure is on the cpu as to not put excesive force on it. but with your idea incorperated i could use a thin peace of balsa wood. maybe 2" wide by 1/2" think and the distance of the tabe. it is cheap stuff to get. then engrave a spot for a zif socket to mount it. hmmm. well i am waiting on this other job to come through and i should have more 1" angle aluminum to do some more work on it with.. will try to get this fram built all the way soon. when i do i will try to get pictures..

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ok i couldn't keep it there.. just to big..

Lionmaster

what about the eventual wear down of the processor reducing pressure of the lap. because the way your describing it the different thicknesses of different sand papers would need a different height for the processor to be at, you could eliminate the need to adjust the height if you have the processor be clampes into a mount then brought up/down to the lapping surface with springs giving a more constant pressure to the surface nomatter what paper is underneath it or how much ihs has been lapped away wouldn't some springs work for a more constant applied pressure on the cpu

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The Fryer

thats the problem. it is not good to lap a processor useing much more than its own weight. it is better to go light as it takes off only what needed, if extra pressure is applied it could take off to much. i want to be able to do it just right and get the best results that i can, and make the results replicable over and over agin.

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ok i couldn't keep it there.. just to big..

Slink

I was talking about separating the measurement process from the lapping process. I did not mean to use that board (of which I spoke) to be used for lapping--only for helping to measure levelness.

Using a handle might also be a good idea, but I recommend not using a handle or ZIF socket, but actually having something in which you can "drop" the CPU die side down (a guide, perhaps?) so that it can be held steady (laterally), and you can control how much pressure is used while holding it down, without having anything extra weighing the CPU down.

Or perhaps you could make a small weight with a ZIF socket on it? Then you could put the weight with CPU inserted, die side down, into the "guide" that holds it steady while lapping.

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Gumby.

you would need to have the processor near the outrside of the spinning disc as the sand paper closer to the middle would be traveling a smaller distance, this also means that wherever you put the processor it would still have to be constantly rotating to avoid sanding one side down further than the other. The idea in itsself is not a bad one but it is unfortunatly to impractical.

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