Making pantorouter followersWhen I did my pantorouter comparison with the all-metal version that Kuldeep builds, I mentioned that I liked how Kuldeep made the followers with a bearing on a shaft, but didn't have a way to attach a bearing myself, so I'm keeping with the old system of mounting follower bearings on my wooden pantorouter.
I received many suggestions, such as using Locktite to mount the bearing on the shaft. But my real problem is actually that shaft size and bearing holes in the bearings I have don't match. But with so many suggestions, I started thinking about how to make round followers on shafts for my pantorouter.
If I cut a thread on the end of the shaft, I could then mount various nuts on it, like this knock down nut with a nice wide circular flange, so it already forms a round follower. You can buy nuts like that at The Home Depot.
Or I could put a hex nut on the end of the shaft and grind that round on my bench grinder. With a bit of sanding and polishing, that makes for a fairly easily sliding round follower, and it turned out quite precise too.
1/2" bearings have smaller holes in them, but using the same technique on the bench grinder I was able to grind the shaft down so it fit in the bearing, though not tightly. But some shims, cut from aluminium cans, made for a tight fit.
Whenever I take something apart, I always keep the washers and other small hardware that might be useful. So I have a whole drawer full of round bushings and spacers, and I started to dig through those to see what might work.
I found some bushings that fit snugly on the 6 mm shafts I was using. I used 6 mm to make it compatible with Kuldeep's. I used one bushing as a follower directly and ground another one down a little (again on the bench grinder) to fit the hole of a 26 mm bearing I had. Again, with a shim from an aluminium can to make it fit snug. I also found one bushing that fit perfectly between the 6 mm shaft and the 8 mm hole for another bearing.
You could also make your followers out of 1/4" bolts, which already have threads on them. Combined with a nut with integral washer, as shown, all you would have to do is glue the nut on and cut off the bolt head to make a follower.
But one size I didn't have was 1" (25.4 mm), so I decided to make one that size out of wood.
I started by cutting a slightly larger circle from Baltic birch plywood on the bandsaw. The hole I drilled is a bit undersized for the shaft. I roughened up the end of the shaft and used some Gorilla glue in the hole and shaft, then drove the shaft in with a hammer.
I'm guiding the shaft with a piece of wood, near the end to make sure it's steady. I ended up sanding that one down to just under 1", then applied some UHMW tape to it to bring it back up to size and make it slide easier.
UHMW tape is also useful for up-sizing metal followers. Each turn of UHMW tape adds 0.3 mm to the diameter of the follower. Just be sure to have a whole number of turns on the follower so the tape is the same thickness all around.
I made a mounting block to clamp the 6 mm shaft on my pantorouter. I didn't have a 6 mm drill, but a 15/64" drill made for a hole that fit the 6 mm shaft just snugly. The only change I had to make to my wooden pantorouter was to drill a 17/64" (6.7 mm) hole all the way through the operating lever, then mount the new holder. The orange knob on the holder clamps the block together to lock the 6 mm shaft in it. That knob came from a broken Ryobi circular saw.
Making tapered and slotted tenon templatesHaving figured out how to make followers like on the all metal pantorouter, the next challenge was to make the clever templates with the slot in the middle and tapered edges around the outside. The tapered edges of the tenon template allow fine adjustments in tenon size to be made.
I set my table saw to four degrees, then cut a bevel on a piece of 18 mm thick Baltic birch plywood. 18 mm is perhaps a bit thick, but I figured more thickness is better, and the next thinnest Baltic birch plywood I had was 11 mm.
I tilted the bandsaw to four degrees, checking it with a speed square, because my homemade bandsaw doesn't have any angle scale.
For my first tapered template, I drew the semicircles on the front (the narrow side), but then realized the disk sander table doesn't tilt towards the disk. Oops! That's why I drew the semicircles on the back this time. I was however able to tilt the strip sander table towards the belt a bit, but the disk sander is better for this job.
Despite being very careful, I got the line about 1 mm off center and, worse yet, about 0.2 mm higher on one side. Arrgh! Sliding the template on a router table to cut the slot could be iffy, but would avoid the possibility of getting the angle wrong. I ended up "fixing" it by doing a plunge cut on the table saw (with the template held down against the fence), then finishing it with a chisel.
But if you haven't built a pantorouter yet, I'd recommend starting out with just a bearing on a block and leave these fancy followers for a later upgrade. You probalby want to start using your pantorouter as soon as possible, and mounting a bearing on a block is much easier.
Also, if you attach the follower bearing on the block with a countersink screw, if you back out the screw just a bit, the bearing can slide the same amount in all directions. So even with the "old" method of making the followers, you can still effectively adjust the fit, making the tenon slightly smaller by loosening the bearing mounting screw.
Dave Tenney on
making tenon templates
using these templates
Tearing down a printer for 8 mm and 6 mm shafting
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