Ideal Dog holes in Spoil board config
20mm with 96mm spacing Like Festool? / MFT
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I was recently doing some testing, deciding if I want to add Dog holes and I picked 20mm out of the air, it seemed like a good size.
I wonder if there is a reason for the 96mm spacing. I can’t think of anything obvious like an even number of inches or anything.
Do you know what type of clamps your going to use? If your gonna use eccentrics I’d figure out how many different sizes you’d need to cover all possible positions in the gap. I wouldn’t want to end up needing too many sizes.
I just remembered you can use some scrap for spacing and don’t need need different sizes. Derp!!!
I use 100mm spacing for 20mm dog holes (which I 3D print), it’s nice and round (the spacing, not the hole, which coincidentally is round too).
I use eccentrics (3D printed of course) and have a boat load of various spacers as needed.
apparently 96mm is from related to the The “32 mm system” is a European standard for frameless cabinets that uses a grid of holes 32 mm apart to mount almost everything.
seems silly not to be 100mm
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considering using these clamps. https://www.youtube.com/watch?v=6EdHqrcmGq0
Seems awfully convoluted. I use dog hole inserts on two sides of the part to be held and if I need to machine close to the edge I just put a small, low profile spacer between the dog hole peg and the part.
The eccentric does have the tendency to shift the part unlike the system with the flats but the eccentric just fits over the dog hole peg and if I reverse the eccentric it pushes the part the other direction. I can orient the eccentric to push the part into the ‘V’ of the pegs. Again, I can use a small low profile spacer if I need to machine near the edge of the part.
I use a combination of dog holes, 3d printed dogs and cams. Plus I have 1/4-20 threaded inserts every 3 inches (76.5 mm) across the waste board, and 3/4 t-tracks.
It creates a grid that is easy to attach any combinations of hold downs.
I use Imperial measurements, but for the dog holes, 19mm is standard. The holes are 19.5 mm so the dogs fit easily.
Here is the SVG of the layout if you want to use it. I have a section at the front that is removable for my Rotary that drops in as well as a and vertical clamping jig.
You can swap out 1/4 20 for M5 or M6.
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Looks like you have all the bases covered! From multiple angles even. You can’t have too many options for holding stuff down.
Nice work!
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