Just another bit of input...
I use the Jasper jigs too - great tool. I always use a spoilboard and I clamp the baffles and the SB to the bench together. I've gotten into the habit of using two 1-1/4" finishing nails to hold the center piece down. Just nail it (nails 180 degrees apart) to the spoil board and use a 1/8 pin punch to set the heads below the top of the baffles. I don't really have a use for the center plugs, so the nails don't bother me. They're easy to pull off the SB with a claw hammer when you're done. It's a lot easier than dealing with double back tape.
I use a 1/4" carbide bit (basically an end mill) like most people and do the 3/4" material in 3 cuts. You could could do it in 1 or two, but why stress out over it? Take your time and enjoy the sawdust.
I use the Jasper jigs too - great tool. I always use a spoilboard and I clamp the baffles and the SB to the bench together. I've gotten into the habit of using two 1-1/4" finishing nails to hold the center piece down. Just nail it (nails 180 degrees apart) to the spoil board and use a 1/8 pin punch to set the heads below the top of the baffles. I don't really have a use for the center plugs, so the nails don't bother me. They're easy to pull off the SB with a claw hammer when you're done. It's a lot easier than dealing with double back tape.
I use a 1/4" carbide bit (basically an end mill) like most people and do the 3/4" material in 3 cuts. You could could do it in 1 or two, but why stress out over it? Take your time and enjoy the sawdust.
Boris_The_Blade said:
This is what I do. You get the exact radius needed and no slippage. Doesn't take much time to setup either and a single bit of wood will cut many holes - infact I've been using the same jig for around 3 years now and its done a lot of cutouts!
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MJL21193 said:
MJL21193 said:
We might disagree on the plywood thing,
but nice work - I especially like the calibration on your compass jig. Something like this'll take a while to fabricate, but will be far more flexible than either the Sears or Jasper jigs. It's also handy to have a plunge router dedicated just to the circle jig.
I too have a simple jig made of wood and it works just fine.
My tip for avioding the problem of cutting right through so that the center piece of wood breaks free.
1. I place a largish piece of scrap mdf on my wooden work bench - only needs to be 5mm or whatever
2. Clamp the uncut baffle on top of it
3. Hammer 2 or 3 medium gauge nails through the centre piece, evenly spaced and well clear of where the cut will be happening
4. Make sure the nails are flush
5. Route away using light passes
6. Once I have routed through, I always make a final pass again - this will give a better finish - you wouldn't expect any more material to be cut off, but there is always a tiny bit - always did this when building galley cabinets and fitout for boats in a previous life
7. Unclamp the baffle and lift away leaving the circular piece of waste nailed to the workbench
Too easy!
My tip for avioding the problem of cutting right through so that the center piece of wood breaks free.
1. I place a largish piece of scrap mdf on my wooden work bench - only needs to be 5mm or whatever
2. Clamp the uncut baffle on top of it
3. Hammer 2 or 3 medium gauge nails through the centre piece, evenly spaced and well clear of where the cut will be happening
4. Make sure the nails are flush
5. Route away using light passes
6. Once I have routed through, I always make a final pass again - this will give a better finish - you wouldn't expect any more material to be cut off, but there is always a tiny bit - always did this when building galley cabinets and fitout for boats in a previous life
7. Unclamp the baffle and lift away leaving the circular piece of waste nailed to the workbench
Too easy!
ShinOBIWAN said:
Posh git!
Thanks Ant. Jigs good for up to a 30cm radius. I have those 60cm drivers on order...
chrisb said:
We might disagree on the plywood thing,
Something like this'll take a while to fabricate, but will be far more flexible than either the Sears or Jasper jigs. It's also handy to have a plunge router dedicated just to the circle jig.
Thanks Chris,
I love working with BB, and to be honest, I'm not going to be using MDF anymore. I will use BB and cover that with HDF if I want to paint.
Not that MDF sounds bad, I just don't like working with it anymore.
BTW, it took what amounts to a full working day for me to build the plunge base and the circle jig.
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MJL21193 said:
Thanks Ant. Jigs good for up to a 30cm radius. I have those 60cm drivers on order...
Thanks Chris,
I love working with BB, and to be honest, I'm not going to be using MDF anymore. I will use BB and cover that with HDF if I want to paint.
Not that MDF sounds bad, I just don't like working with it anymore.
nope, not taking the bait
so at $5/hr that still costs less than the Jasper jig twin set required to cover the full range this one can cover
but seriously, a jig like this is infinitely adjustable to whatever calibration you choose, and barring accident should last forever
chrisb said:
Gee Chris, is that all you make over there? You could come over here and make, oh at least $7.50/hr, a good apprentice like you!
Remember now, the jig itself was a piece of cake - the plunge base for the laminate trimmer took most of that day.
See I used BB plywood.
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The bit you use is very important.
I've tried using a good quality 1/4" diameter 2 flute straight bit and it sucked for cutting circles in mdf. If I needed a clean cut I had to make 4 passes through .75" mdf. If I try cutting deeper, the router vibrates badly.
I just bought a 1/8"diameter upcut spiral bit. Haven't used it yet, but I expect it will be great for cutting circles. Less diameter means less dust, and the shape of the bit should keep vibration down.
http://www.rockler.com/product.cfm?page=5298
Dan
I've tried using a good quality 1/4" diameter 2 flute straight bit and it sucked for cutting circles in mdf. If I needed a clean cut I had to make 4 passes through .75" mdf. If I try cutting deeper, the router vibrates badly.
I just bought a 1/8"diameter upcut spiral bit. Haven't used it yet, but I expect it will be great for cutting circles. Less diameter means less dust, and the shape of the bit should keep vibration down.
http://www.rockler.com/product.cfm?page=5298
Dan
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