Video 4 of low budget frame jig series. On to the bottom bracket fixture section of the bicycle frame jig. Play List: • Pithy Bikes - Low Budg... Music Bad Snacks / @badsnacks
The nearest to 1/2" threaded rod is 12mm (known as M12). The most common sizes of ply are 6mm, 9mm, 12mm and 18mm (approximately equivalent to 1/4", 3/8", 1/2" and 3/4").
Most countries in Europe use a multiple of 3mm. Starting at 3 ranging up to 18, than 22 for some reason. Thicker materials are less common but I have seen 25, 28 and 32mm as well.
I'm so happy to see this series, because I wouldn't able to make proper jig, maybe this knowledge bring me to building a frame, thanks for your all wisely tutorials.
Spooky. Earlier today, I was thinking about a bike building book I purchased a few years back, and was wondering about jigs. Low and behold, your video popped up in my feed. Praise be to the bicycle gods :)
In Australia plywood is easily available in so many sizes. 4,6,7,9,12,15,17,18,19,21mm seem very common. I’m sure thicker than 21 might be available but I’ve never needed it.
A wood block in place of the "pinch bolt" with a "tee nut" or threaded insert pointed vertically could be a viable and easy/cheap clamping option. No need to pinch the sides if enough down force is provided. I can provide more details if needed. I love this low cost frame jig idea!
You could use a wedge between the thread and the clamp, this puts the clamping force in the correct direction and the friction between the plywood parts will keep it steady. This also means you can forego with the knob.
Nice work. I guess for that clamp you want something also clamping upwards against the bottom of the wooden frame. It would mean two things to tighten up when you adjust it though which is OK but not ideal. Will be interesting to see what you come up with :)
Most plywood sold in the US is actually metric thicknesses, measure it and see. Check the listing at home depot or wherever you are buying it, 3/4in will probably say 23/32 or .709 which is 18mm, 1/2in is probably .472 or 12mm.
In Germany you get very weird thicknesses for plywood (like 18mm or 25 but not 20) so my guess is that they just take imperial sizes and put the nearest measure in metric on it
Thanks for sharing your fixture with us. Maybe your design can add a second clamping bolt at the axle end? Of course this would require a slot in the frame. I don’t think it would weaken the frame in any noticeable way. Joel......
1/2" = 12mm or M12. Plywoord if you use birch. The proper European stuff from Finland or the Baltic’s. It would be the following. I’m going to give you the common name and the the actual thickness. 4 mm = 3.65 mm ,6 mm = 6.5mm , 9 mm = 8.7 mm, 12 mm = 11.7 mm, 15 mm = 14.7 mm , 18 mm = 17.6 mm, 21 mm = 20.7 mm , 24 mm = 23.7 mm , 27 mm = 26.7 mm. If you add a laminate it will be thicker and the the two thinner once differ from batch to batch. But in 9 years of professionally CNC’ing plywood furniture I have not seen. More than a 0.05 mm variants. Hope this help @pithy bikes.
3/4 inch ~ 20mm and this is common thicness of plywood. There is a little problem with 1/2 inch because, 1/2inch in metric is 12.7mm. neerest thicness od plywood is 10mm, 12mm and 15mm ofc i mean common thicness of ply. I Hope you can underestand my broken english. Sorry i'm not native speaker :(
Baltic birch plywood is metric already, so technically it doesn't matter. Also, 1/8 inch is so close to 3mm, for something like this it's probably not a problem to use metric steel either.
Are you going to upload the STL for the knob? What material did you print it out of? I have a 3D printer and am contemplating building this jig. I just wish I was half as cool as you.
Plywood found in France thickness : 3 (1/8"), 5, 6 (1/4"), 8, 10, 12 (1/2"), 15, 16, 18, 19, 22, 24, 25 (1"), 30 mm width : 1,22 m (4') et 1,53 m (5') Length : 2,50 m (8') et 3,10 m (10') from fr.wikipedia.org/wiki/Contreplaqu%C3%A9
Next time just rotate the block on the drill table. If is a square block with equal separated holes you can just rotate the block on the jig that you made on the table.
Lucas Rodrigues good idea but the blocks are not equal as I would like. I’m also assuming other builders might not get them equal. If I offer a kit, this will all be done with cnc.
The nearest to 1/2" threaded rod is 12mm (known as M12). The most common sizes of ply are 6mm, 9mm, 12mm and 18mm (approximately equivalent to 1/4", 3/8", 1/2" and 3/4").
Seconded.
Most countries in Europe use a multiple of 3mm.
Starting at 3 ranging up to 18, than 22 for some reason. Thicker materials are less common but I have seen 25, 28 and 32mm as well.
To be honest, I'm pretty sure Baltic birch is always metric because it is made in Europe.
I'm so happy to see this series, because I wouldn't able to make proper jig, maybe this knowledge bring me to building a frame, thanks for your all wisely tutorials.
Spooky. Earlier today, I was thinking about a bike building book I purchased a few years back, and was wondering about jigs. Low and behold, your video popped up in my feed. Praise be to the bicycle gods :)
In Australia plywood is easily available in so many sizes. 4,6,7,9,12,15,17,18,19,21mm seem very common. I’m sure thicker than 21 might be available but I’ve never needed it.
I have a few sheets of 30mm for furniture building laying around, and there are even thicker ones.
A wood block in place of the "pinch bolt" with a "tee nut" or threaded insert pointed vertically could be a viable and easy/cheap clamping option. No need to pinch the sides if enough down force is provided. I can provide more details if needed. I love this low cost frame jig idea!
You could use a wedge between the thread and the clamp, this puts the clamping force in the correct direction and the friction between the plywood parts will keep it steady. This also means you can forego with the knob.
Great work
Music on-point as usual, thanks for sharing your time and your improvements.
Nice work. I guess for that clamp you want something also clamping upwards against the bottom of the wooden frame. It would mean two things to tighten up when you adjust it though which is OK but not ideal. Will be interesting to see what you come up with :)
Most plywood sold in the US is actually metric thicknesses, measure it and see. Check the listing at home depot or wherever you are buying it, 3/4in will probably say 23/32 or .709 which is 18mm, 1/2in is probably .472 or 12mm.
This is correct. Baltic Birch is metric.
In Germany you get very weird thicknesses for plywood (like 18mm or 25 but not 20) so my guess is that they just take imperial sizes and put the nearest measure in metric on it
You might line the clamping plates with adhesive backed sandpaper. If you are concerned with it wearing the bar, then some rubber.
1/2” threaded rod is easy to get here, as is M12.
Kit? Yes!
Thanks for sharing your fixture with us. Maybe your design can add a second clamping bolt at the axle end? Of course this would require a slot in the frame. I don’t think it would weaken the frame in any noticeable way. Joel......
1/2" = 12mm or M12. Plywoord if you use birch. The proper European stuff from Finland or the Baltic’s. It would be the following. I’m going to give you the common name and the the actual thickness. 4 mm = 3.65 mm ,6 mm = 6.5mm , 9 mm = 8.7 mm, 12 mm = 11.7 mm, 15 mm = 14.7 mm , 18 mm = 17.6 mm, 21 mm = 20.7 mm , 24 mm = 23.7 mm , 27 mm = 26.7 mm. If you add a laminate it will be thicker and the the two thinner once differ from batch to batch. But in 9 years of professionally CNC’ing plywood furniture I have not seen. More than a 0.05 mm variants. Hope this help @pithy bikes.
Also m12 threded rod is super common ;)
Great job!
3/4 inch ~ 20mm and this is common thicness of plywood. There is a little problem with 1/2 inch because, 1/2inch in metric is 12.7mm. neerest thicness od plywood is 10mm, 12mm and 15mm ofc i mean common thicness of ply. I Hope you can underestand my broken english. Sorry i'm not native speaker :(
3/4 of an inch is almost exactly 19mm. 19.05 to be precise.
I would stick with 3/4 and 1/2 an inch. These can be easily exchanged with 19mm and 12mm ply. 12mm Threaded rod is easily bought as well.
Baltic birch plywood is metric already, so technically it doesn't matter. Also, 1/8 inch is so close to 3mm, for something like this it's probably not a problem to use metric steel either.
Shim both sides of the clamping jig to prevent wiggle ;-)
Its weird in the Philippines cuz the common standards for our plywood is metric but imperial for screws, bolt and threaded rod.
Are you going to upload the STL for the knob? What material did you print it out of? I have a 3D printer and am contemplating building this jig. I just wish I was half as cool as you.
Reed McFarland yeah I can upload the stl. I wanted petg but had to use pla because that’s only filament I could get the color in.
Plywood found in France
thickness : 3 (1/8"), 5, 6 (1/4"), 8, 10, 12 (1/2"), 15, 16, 18, 19, 22, 24, 25 (1"), 30 mm
width : 1,22 m (4') et 1,53 m (5')
Length : 2,50 m (8') et 3,10 m (10')
from fr.wikipedia.org/wiki/Contreplaqu%C3%A9
Next time just rotate the block on the drill table. If is a square block with equal separated holes you can just rotate the block on the jig that you made on the table.
Lucas Rodrigues good idea but the blocks are not equal as I would like. I’m also assuming other builders might not get them equal. If I offer a kit, this will all be done with cnc.
Hi will the plans of the jig be available to download? Thanks in advance and keep the amazing work, 1 more sub!