Keyboard template

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Panchdara
Posts: 14
Joined: Sat May 15, 2021 9:02 am

Keyboard template

Post by Panchdara »

I got bored last night and drew up CAD for the keyboard template. I have attached it (in 2 forms). It was drawn in QCAD but should be readable in many CAM s/w (??). Please feel free to use as you see fit. There is no copyright.This is based on https://technical.swissmicros.com/graph ... y_DM42.PDF

Attached a couple CAD dawings, if interested.
DM41X-DM42.zip
(34.46 KiB) Downloaded 49 times
edit: please report any issues. Best regards.
NYC41
Posts: 34
Joined: Wed Jun 07, 2017 4:23 pm

Re: Keyboard template

Post by NYC41 »

Thanks for pointing out the key_overlay_dm42.pdf. I read it and it is missing a few measurements, most critically the inter-key distance on the top four rows of keys. The width and height of those keys is shown (left-most column for width, and the row spacing is shown for all rows). If this is provided, the Enter key size can also be calculated.

Thanks!
DM42 SN: 00085, DM41X SN: 00517, DM41L SN: 00391
HP-01; HP-41C, CV, CX, CL, CY; many others
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Walter
Posts: 1942
Joined: Tue May 02, 2017 11:13 am
Location: Close to FRA, Germany

Re: Keyboard template

Post by Walter »

That inter-key distance (IKD) on the top four rows of keys can be calculated easily: Key width is 7.7, overall width is 70.5, distance to the edge is 2.65. So IKD = ( 70,5 - 6 x 7.7 - 2 x 2.65 ) / 5 = 3.8 mm. And the width of the enter key is hence 2 x 7.7 + 3.8 = 19.2 mm.
DM42 SN: 00041 β
WP 43S running on this device

HP-35, HP-45, ..., HP-35S, WP 34S, WP 31S, DM16L
Panchdara
Posts: 14
Joined: Sat May 15, 2021 9:02 am

Re: Keyboard template

Post by Panchdara »

Yup, as Walter states the upper keys can (and have been) calculated (on a DM42!!). If you open the DXF file you will see a dimension layer that is hidden/locked. Unhide it and all the dimensions will be shown.

Attached is pdf of the measurements too. However, don't use this pdf as scale, raher use the DXF/DWG.

Note: I have assumd the physical button EXIT is same size as F1...F6 and the ENTER is same witdh as F1 <-> F2

Best
DM41-42 Kbd Template.pdf
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Walter
Posts: 1942
Joined: Tue May 02, 2017 11:13 am
Location: Close to FRA, Germany

Re: Keyboard template

Post by Walter »

Please note that is a classical CAD drawing - meaning the dimensioning doesn't make sense in real life. If you want to make an overlay, you will need a piece of flat material 89.5mm long and 72,5mm wide. Furthermore, some dimensions are overdetermined. And following old tradition, no tolerances are given.
DM42 SN: 00041 β
WP 43S running on this device

HP-35, HP-45, ..., HP-35S, WP 34S, WP 31S, DM16L
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