I need some hold down knobs to secure fixtures on my table saw sled and also on the CNC to secure stock to be machined. But I don't want to buy any so figured I'd make some out of 1/2" MDF. This was my first time to use the circular pattern capabilities in Fusion 360 to create the grips and it works like it is suppose to so that's a good thing. These were fun to make so I made 20 of them - 12 in 2.5" diameter and 8 in 1.5" diameter. Some will have brass threaded 1/4-20 inserts and some will have hex head 1/4-20 bolts. The video below shows cutting the hex recess into four of the knobs.
Nice, David. I make all my knobs but don't have a CNC machine. I've found that T-nuts work better for me than the threaded inserts. I use the knob so that the T-nut is pulled into the knob when in use. Just a thought for you.
Thanks, Richard! I thought about T-nuts but decided on the brass inserts and bolts.
Just curious - does the YouTube video play ok for y'all? It played fine after I posted it last night but now when I try to view it the opening screen (title, I guess) stays on for a long time but it's only suppose to be on for 10 seconds and then shows my putting the knobs into the fixture. My computer went through an update last night and one of the updates is to Flash so I'm wondering if it's my computer or the YouTube video. The raw native mp4 file plays fine and I'm wondering if I need to delete this one and upload it again...
Looks good. Just curious how long the MDF lasts. I've made some out of BB plywood as well as assorted hardwood scraps. Using t-nuts as well as pressed in hex nuts. So far they only thing that causes a failure is an unexpected trip through them with a spinning router bit. Never had one split or fail during use though.
Very nice, the CNC certainly makes it easy to get a larger knob if needed. I bought some "rubbery" slip-ons for the hose bibs here at the house as my wife was having trouble turning them on when she wanted to water her flowers - just that little increase in diameter made it so much easier for her.
I really need something like that for the leg locking knobs on my workbench as I'm starting to have trouble with the smaller knobs - wondering if I cutout a larger OD knob with an inside profile to fit the existing knobs whether that would work. When I bought the covers for the hose bibs, I was actually looking for a wrench that I'd seen that fits over the knob - I couldn't find it at the time but these have worked out OK - and no wrench to get lost
I bought some "rubbery" slip-ons for the hose bibs here at the house as my wife was having trouble turning them on when she wanted to water her flowers - just that little increase in diameter made it so much easier for her.
Thanks, Mike! I don't know what happened with the first one. It uploaded fine but took a little while to process on their end. I played it last night when I uploaded it and it worked then but something must have gone wrong.
Unless you are extremely patient and brilliant at CAD and tool path creation, no CNC will be the only thing needed to turn out finished for-sale/give-away toys and games. Even if you are (patient and brilliant) there is little chance a whole shop of more conventional tools won't also be put to use supporting the CNC projects.
Since adding a CNC to my shop my other tools have gotten MORE use. Hardwood from whatever source rarely starts out the size you need it to be. Trim to length, rip to width, join and plane to final thickness are doable on a CNC, but still far easier to do on 2 saws, a jointer and a planer. Then I might cut a curvy profile followed by tenons at a compound angle off the end using my CNC.
4D
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