Drum construction specs

[brentnallt]

Hi,

I'm loving this project so far.
I'm drawing up some files to grab quotes from fabricators, and just had a few questions regarding the construction of the drum:

• How large is the gap between panels (and is this the same between all panels?)
• Is it possible to grab the drill offsets and their bit diameter? I can infer their positions if provided with the centerpoint measurements for the coloured lines in the attached picture.

I'd be eternally grateful if you could help me with this.
Cheers

[ravinrabbid]

Hi,

I've reconstructed the measurements from various pictures of disassembled arcade drums I've found, so they a probably not very accurate. Here is what (I think) I've used:

• Panel gaps: ~4mm (On the original the two short gaps between the outer rings look a bit larger)
• Red: H:45mm V:260mm
• Green: H:164mm V:44mm
• Cyan: H:214mm V:196mm
• Orange: 262mm
• Pink: 388mm
• Blue: 196mm
• Purple: 44mm
• Drill diameters are are based on based on the threaded inserts I used (M4 and M6 for the large and small ones respectively)
• The holes on the cyan line are 18mm on the original, I've used 10mm. I think they can be omitted entirely since they are probably only used to access the screws to mount the back plate to the drum housing.

Take all those values with a grain of salt since I had to increase the outer diameter to 425mm because the manufacturing service I've used could not produce anything smaller and I don't remember if I've adjusted some of the distances because of that.

Here are some of the pictures I've based my measurement on if you want to check yourself:

• http://bayon-game.com/?p=20611
• https://note.com/wgc_tencho/n/n95ddb010231f
• https://note.com/wgc_tencho/n/n4b5fe5376c0c
• https://nitter.net/mansokagoshima/status/1242775005626134528

I hope this helps, have fun building!

[brentnallt]

This is perfect, thank you so much