Cherry frame cut out dimensions

[bpiphany]

Is it even mathematically possible to decipher these? They are a f**king mess to say the least =P

I'm pretty sure the reference line for that 0.166" measurement on the left is off at least. Shouldn't it be at the very left most part of the cut out?

[Findecanor]

I think it looks reasonable. A bit tricky to transfer to a paper pattern perhaps.

You are using stabilizer bars for plate-mounting, are you not? The bars for plate-mounting and PCB-mounting are different. These measurements are probably really weird for PCB-mounting.

[bpiphany]

The distances between the crosses are of course the same with plate and pcb mounted stabilizers. The pcb mounted ones are easy. Why can't they just give all interesting distances from the same reference point?.. I've been working them out today, it wasn't totally impossible except for that typo on the web page. Their pdf says the right things (in mm though)... I will upload a drawing when I've had time to put everything into the computer.

[bpiphany]

Something like this is what I wanted. Assuming the cherry engineers, being german and all, designed the thing in mm to start with this probably haven't gone through too many rounding errors... I really should read up some on how svg graphics work but for noe it will be png.


Here are the coords. start_x start_y end_x end_y for each line segment. Clockwise order as holes should be defined according to my standards. I will do the 2x wide key stabilizer tomorrow, I'm off to bed.

Code: [Select]

A = 38.1 mm
 -7.0000 -7.0000   7.0000 -7.0000
  7.0000 -7.0000   7.0000 -2.3000
  7.0000 -2.3000  15.7250 -2.3000
 15.7250 -2.3000  15.7250 -5.5300
 15.7250 -5.5300  22.3750 -5.5300
 22.3750 -5.5300  22.3750 -2.3000
 22.3750 -2.3000  23.2500 -2.3000
 23.2500 -2.3000  23.2500  0.5000
 23.2500  0.5000  22.3750  0.5000
 22.3750  0.5000  22.3750  6.7700
 22.3750  6.7700  20.5500  6.7700
 20.5500  6.7700  20.5500  7.9700
 20.5500  7.9700  17.5500  7.9700
 17.5500  7.9700  17.5500  6.7700
 17.5500  6.7700  15.7250  6.7700
 15.7250  6.7700  15.7250  2.3000
 15.7250  2.3000   7.0000  2.3000
  7.0000  2.3000   7.0000  7.0000
  7.0000  7.0000  -7.0000  7.0000
 -7.0000  7.0000  -7.0000  2.3000
 -7.0000  2.3000 -15.7250  2.3000
-15.7250  2.3000 -15.7250  6.7700
-15.7250  6.7700 -17.5500  6.7700
-17.5500  6.7700 -17.5500  7.9700
-17.5500  7.9700 -20.5500  7.9700
-20.5500  7.9700 -20.5500  6.7700
-20.5500  6.7700 -22.3750  6.7700
-22.3750  6.7700 -22.3750  0.5000
-22.3750  0.5000 -23.2500  0.5000
-23.2500  0.5000 -23.2500 -2.3000
-23.2500 -2.3000 -22.3750 -2.3000
-22.3750 -2.3000 -22.3750 -5.5300
-22.3750 -5.5300 -15.7250 -5.5300
-15.7250 -5.5300 -15.7250 -2.3000
-15.7250 -2.3000  -7.0000 -2.3000
 -7.0000 -2.3000  -7.0000 -7.0000

A = 76.2 mm
 -7.0000 -7.0000   7.0000 -7.0000
  7.0000 -7.0000   7.0000 -2.3000
  7.0000 -2.3000  34.7750 -2.3000
 34.7750 -2.3000  34.7750 -5.5300
 34.7750 -5.5300  41.4250 -5.5300
 41.4250 -5.5300  41.4250 -2.3000
 41.4250 -2.3000  42.3000 -2.3000
 42.3000 -2.3000  42.3000  0.5000
 42.3000  0.5000  41.4250  0.5000
 41.4250  0.5000  41.4250  6.7700
 41.4250  6.7700  39.6000  6.7700
 39.6000  6.7700  39.6000  7.9700
 39.6000  7.9700  36.6000  7.9700
 36.6000  7.9700  36.6000  6.7700
 36.6000  6.7700  34.7750  6.7700
 34.7750  6.7700  34.7750  2.3000
 34.7750  2.3000   7.0000  2.3000
  7.0000  2.3000   7.0000  7.0000
  7.0000  7.0000  -7.0000  7.0000
 -7.0000  7.0000  -7.0000  2.3000
 -7.0000  2.3000 -34.7750  2.3000
-34.7750  2.3000 -34.7750  6.7700
-34.7750  6.7700 -36.6000  6.7700
-36.6000  6.7700 -36.6000  7.9700
-36.6000  7.9700 -39.6000  7.9700
-39.6000  7.9700 -39.6000  6.7700
-39.6000  6.7700 -41.4250  6.7700
-41.4250  6.7700 -41.4250  0.5000
-41.4250  0.5000 -42.3000  0.5000
-42.3000  0.5000 -42.3000 -2.3000
-42.3000 -2.3000 -41.4250 -2.3000
-41.4250 -2.3000 -41.4250 -5.5300
-41.4250 -5.5300 -34.7750 -5.5300
-34.7750 -5.5300 -34.7750 -2.3000
-34.7750 -2.3000  -7.0000 -2.3000
 -7.0000 -2.3000  -7.0000 -7.0000



[Soarer]

Shouldn't it be at the very left most part of the cut out?

Surely it must be, like the other diagram (why the other one says 0.165 is a mystery!)

I would think they did it in inches originally, it was so long ago. And since key spacing is in inches it kinda makes sense to use them. The 1998 datasheet has dimensions in inches, but I don't think there's any way to tell whether it was Cherry DE or Cherry US that produced it.

[bpiphany]

Surely it must be, like the other diagram (why the other one says 0.165 is a mystery!)

I would think they did it in inches originally, it was so long ago. And since key spacing is in inches it kinda makes sense to use them. The 1998 datasheet has dimensions in inches, but I don't think there's any way to tell whether it was Cherry DE or Cherry US that produced it.

Look that's the same pictures as on the web page. They are a bit funky though, not really correct  in accordance to the measurements. I thought inches would have made more sense too. I did those numbers too. Just have to update a few places in the spreadsheet I guess, that shouldn't take too long.

[bpiphany]

Line coords in 0.0001" units (because of KiCAD).

Code: [Select]

A = 0.940"
-2750 -2750  2750 -2750
 2750 -2750  2750 -1920
 2750 -1920  3390 -1920
 3390 -1920  3390 -2240
 3390 -2240  6010 -2240
 6010 -2240  6010  -900
 6010  -900  6350  -900
 6350  -900  6350   200
 6350   200  6010   200
 6010   200  6010  2600
 6010  2600  5600  2600
 5600  2600  5600  3060
 5600  3060  3800  3060
 3800  3060  3800  2600
 3800  2600  3390  2600
 3390  2600  3390  2290
 3390  2290  2750  2290
 2750  2290  2750  2750
 2750  2750 -2750  2750
-2750  2750 -2750  2290
-2750  2290 -3390  2290
-3390  2290 -3390  2600
-3390  2600 -3800  2600
-3800  2600 -3800  3060
-3800  3060 -5600  3060
-5600  3060 -5600  2600
-5600  2600 -6010  2600
-6010  2600 -6010   200
-6010   200 -6350   200
-6350   200 -6350  -900
-6350  -900 -6010  -900
-6010  -900 -6010 -2240
-6010 -2240 -3390 -2240
-3390 -2240 -3390 -1920
-3390 -1920 -2750 -1920
-2750 -1920 -2750 -2750

A = 1.500"
-2750 -2750  2750 -2750
 2750 -2750  2750  -900
 2750  -900  6190  -900
 6190  -900  6190 -2240
 6190 -2240  8810 -2240
 8810 -2240  8810  -900
 8810  -900  9150  -900
 9150  -900  9150   200
 9150   200  8810   200
 8810   200  8810  2600
 8810  2600  8400  2600
 8400  2600  8400  3060
 8400  3060  6600  3060
 6600  3060  6600  2600
 6600  2600  6190  2600
 6190  2600  6190   900
 6190   900  2750   900
 2750   900  2750  2750
 2750  2750 -2750  2750
-2750  2750 -2750   900
-2750   900 -6190   900
-6190   900 -6190  2600
-6190  2600 -6600  2600
-6600  2600 -6600  3060
-6600  3060 -8400  3060
-8400  3060 -8400  2600
-8400  2600 -8810  2600
-8810  2600 -8810   200
-8810   200 -9150   200
-9150   200 -9150  -900
-9150  -900 -8810  -900
-8810  -900 -8810 -2240
-8810 -2240 -6190 -2240
-6190 -2240 -6190  -900
-6190  -900 -2750  -900
-2750  -900 -2750 -2750

A = 3.000"
 -2750 -2750   2750 -2750
  2750 -2750   2750  -900
  2750  -900  13690  -900
 13690  -900  13690 -2240
 13690 -2240  16310 -2240
 16310 -2240  16310  -900
 16310  -900  16650  -900
 16650  -900  16650   200
 16650   200  16310   200
 16310   200  16310  2600
 16310  2600  15900  2600
 15900  2600  15900  3060
 15900  3060  14100  3060
 14100  3060  14100  2600
 14100  2600  13690  2600
 13690  2600  13690   900
 13690   900   2750   900
  2750   900   2750  2750
  2750  2750  -2750  2750
 -2750  2750  -2750   900
 -2750   900 -13690   900
-13690   900 -13690  2600
-13690  2600 -14100  2600
-14100  2600 -14100  3060
-14100  3060 -15900  3060
-15900  3060 -15900  2600
-15900  2600 -16310  2600
-16310  2600 -16310   200
-16310   200 -16650   200
-16650   200 -16650  -900
-16650  -900 -16310  -900
-16310  -900 -16310 -2240
-16310 -2240 -13690 -2240
-13690 -2240 -13690  -900
-13690  -900  -2750  -900
 -2750  -900  -2750 -2750

A = 5.250"
 -2750 -2750   2750 -2750
  2750 -2750   2750 -1920
  2750 -1920  24940 -1920
 24940 -1920  24940 -2240
 24940 -2240  27560 -2240
 27560 -2240  27560  -900
 27560  -900  27900  -900
 27900  -900  27900   200
 27900   200  27560   200
 27560   200  27560  2600
 27560  2600  27150  2600
 27150  2600  27150  3060
 27150  3060  25350  3060
 25350  3060  25350  2600
 25350  2600  24940  2600
 24940  2600  24940  2290
 24940  2290   2750  2290
  2750  2290   2750  2750
  2750  2750  -2750  2750
 -2750  2750  -2750  2290
 -2750  2290 -24940  2290
-24940  2290 -24940  2600
-24940  2600 -25350  2600
-25350  2600 -25350  3060
-25350  3060 -27150  3060
-27150  3060 -27150  2600
-27150  2600 -27560  2600
-27560  2600 -27560   200
-27560   200 -27900   200
-27900   200 -27900  -900
-27900  -900 -27560  -900
-27560  -900 -27560 -2240
-27560 -2240 -24940 -2240
-24940 -2240 -24940 -1920
-24940 -1920  -2750 -1920
 -2750 -1920  -2750 -2750