Here I build the jig that was used in the previous video: • Making a 28ft radius dish The router harness was the subject of an earlier video: • How to make a router e...
love your videos to shine your shafts on the drum sander you might try a local machine shop for bearing shims they should have some brass shims in various thickness. On the drum slander viedo when you were trying to true up.drum you seemed to be in terms possible path out the hard board you had the sand paper glued to if it had been ejected from the machine it could have seriously injured you .
+Pete Howlett Good point. The bridge plate might flatten the top somewhat under the bridge though - I'm not planning on radiusing the bridge plate, but I might clamp it into the radius dish if it flexes enough - if it doesn't I may have to clamp the plate flat (with bridge clamps). It'll be interesting to see how all the competing forces combine as the top is a lot stiffer longitudinally. I know this is all standard stuff, but opinions differ about the methods and outcome. I reckon I'll have a flattened catenary oblate spheroid ;-)
The bridge plate will 'deform' to the radius dish. BGTW, use John Arnold's finding of making it a little over the size of the bridge. Those fat wide and thick maple birdge plates just kill the instrument. Sanding?I mean the underside of the bridge - we always 'fit' the bridge to the top. Dan Erlewine in the Stewmac videos shows how this is best done on an L5
+Pete Howlett What I meant was the top is unlikely to end up the radius of the dish, particularly with a flat plate under the top. I've seen someone refine the bridge fit by sticking a sheet of sandpaper under the bridge in situ - maybe that was Dan.
I wondered around the 9 minute marker if it would be just as good to simply affix a non-stretchable wire to something (i.e, a stranded wire to a lamp post) and then, with a marker tied to the other end, carefully trace the circumferential profile of your router jig rails. Obviously, you'd want to be sure your marker remains vertical. Also, careful alignment of each end of the side rails pieces is key, but this could be done rather easily with the same length of cable shortened per Pythagoras's theorem (or better still, you could ditch math altogether and just drill a hole in the midpoint of the pieces to house a laser cat toy to point at the other end of the line). Caveat: I have not yet tried any of this. I could well be full of it.
Tricky to get it accurate - everything stretches to some extent when you have those sort of lengths, and this has to be millimetre perfect. Look up ‘long compass’ - it’s a much simpler method of drawing arcs, using the maths property that the angle subtended by a chord of a circle is constant
15/28/40ft is a long ways. My thought was to use the flexible 1m ruler and bend it to the over the 90 cm distance to the 11.5mm point and strike a line on MDF. Then use that as a template for each side. Not sure if this radius needs to be perfect. There are other challenges of putting the sled and board on a perfectly flat surface before routing. Making your first guitar is a challenging process of decision making. Susan's journey is a good model to follow.
Susan, never do cross cutting with a fence! Very dangerous! you could damage your blade, and it could fail! I would replace that table saw blade. Better safe than sorry. I have a much loved luthier instructor, with a hand that was almost sliced in half lengthwise due to a damaged blade that failed while he was making a cut.
I am nearly finished building my first guitar, and I spent a couple of MONTHS making spool clamps, cam clamps, dishes, moulds etc and gathering specialist tools before I actually started making the actual instrument. Even then, I found as i went along there were other jigs and things I had to make. But number 2 is going to be much faster work. (No one ever builds just one guitar!)
Check out how much a radius dish costs if you buy one online. Sites: LMII or StewMac (guitar making supplies). Cool how she can save money with a dyi approach.
why do you use you bench/table saw without a guard , when it's slightly less dangerous than sword swallowing with a running chainsaw ? I've watched two very bad accidents with a saw one the blade broke and the other ended up with all the tendons in the guys left hand being severed . I ask this because I see it all the time on TH-cam and if I had have done it at work the #### would have hit the fan .
+Andy Ward I prefer to be able to see what I'm doing (and I always wear eye protection and stand to the side of the cut). I find I have to set the blade higher with the guard because it's attached to the riving knife. I had the work get stuck under the guard once and it ruined the cut. I'm not sure if that's a bad design or whether you have to always make sure the guard is clear of the work, but I didn't like it
Peter Leonard The front and backs of acoustic guitars are domed. One uses the dish to sand the correct curve on the braces and then use it as a clamping caul
You are not going to win any compositions with those gloves?, but I know what you mean about superglue and hands. I a looking forward to the finished item because at the moment I am lost, but I am sure that it is just me being thick and not your videos.
+John Fithian-Franks it was actually the sandpaper I was protecting myself from - 60 grit rips through my skin. :-) To see the finished dish you have to go to the previous video. A radius dish is used for sanding and clamping domed surfaces - in this case a guitar front/back - you'll see that in a few videos time.
Your planning and attention to detail is astounding! Great work...
+bucknaked31 thank you :-)
I was using a sanding dish just this week. You make great videos. Please never stop.
Looks like this was a long job. Well done for having the patience to complete it.
Thank you for these videos. They will be a great resource for my my first build.
Love your video's. You should have a TV show.
Seconded!
I just wish I had something this interesting to post to youtube...
love your videos to shine your shafts on the drum sander you might try a local machine shop for bearing shims they should have some brass shims in various thickness. On the drum slander viedo when you were trying to true up.drum you seemed to be in terms possible path out the hard board you had the sand paper glued to if it had been ejected from the machine it could have seriously injured you .
Blue-tac or Vasilene will hold the washers.
you can never have enough clamps!!!
thank you
That sanding stick will be useful when you need to pre-profile the underside of the bridge....
+Pete Howlett Good point. The bridge plate might flatten the top somewhat under the bridge though - I'm not planning on radiusing the bridge plate, but I might clamp it into the radius dish if it flexes enough - if it doesn't I may have to clamp the plate flat (with bridge clamps). It'll be interesting to see how all the competing forces combine as the top is a lot stiffer longitudinally. I know this is all standard stuff, but opinions differ about the methods and outcome. I reckon I'll have a flattened catenary oblate spheroid ;-)
The bridge plate will 'deform' to the radius dish. BGTW, use John Arnold's finding of making it a little over the size of the bridge. Those fat wide and thick maple birdge plates just kill the instrument. Sanding?I mean the underside of the bridge - we always 'fit' the bridge to the top. Dan Erlewine in the Stewmac videos shows how this is best done on an L5
+Pete Howlett What I meant was the top is unlikely to end up the radius of the dish, particularly with a flat plate under the top. I've seen someone refine the bridge fit by sticking a sheet of sandpaper under the bridge in situ - maybe that was Dan.
Thats what we do... yeah you don't get it exact but you can radius
the bridgeplate....
Excellent. Thanks!
Outstanding!
I wondered around the 9 minute marker if it would be just as good to simply affix a non-stretchable wire to something (i.e, a stranded wire to a lamp post) and then, with a marker tied to the other end, carefully trace the circumferential profile of your router jig rails. Obviously, you'd want to be sure your marker remains vertical. Also, careful alignment of each end of the side rails pieces is key, but this could be done rather easily with the same length of cable shortened per Pythagoras's theorem (or better still, you could ditch math altogether and just drill a hole in the midpoint of the pieces to house a laser cat toy to point at the other end of the line).
Caveat: I have not yet tried any of this. I could well be full of it.
Tricky to get it accurate - everything stretches to some extent when you have those sort of lengths, and this has to be millimetre perfect. Look up ‘long compass’ - it’s a much simpler method of drawing arcs, using the maths property that the angle subtended by a chord of a circle is constant
@@SusanGardener Thanks, I will!
15/28/40ft is a long ways. My thought was to use the flexible 1m ruler and bend it to the over the 90 cm distance to the 11.5mm point and strike a line on MDF. Then use that as a template for each side. Not sure if this radius needs to be perfect. There are other challenges of putting the sled and board on a perfectly flat surface before routing. Making your first guitar is a challenging process of decision making. Susan's journey is a good model to follow.
Oh I read "radish dish jig", took me a minuet.
you are awesome
Susan, never do cross cutting with a fence! Very dangerous! you could damage your blade, and it could fail! I would replace that table saw blade. Better safe than sorry. I have a much loved luthier instructor, with a hand that was almost sliced in half lengthwise due to a damaged blade that failed while he was making a cut.
thanks, enjoyed the video Susan, anymore guitar build's to come ?
+Roger Appleby I'm getting there. I need to make the tools to do the work!
I am nearly finished building my first guitar, and I spent a couple of MONTHS making spool clamps, cam clamps, dishes, moulds etc and gathering specialist tools before I actually started making the actual instrument. Even then, I found as i went along there were other jigs and things I had to make. But number 2 is going to be much faster work. (No one ever builds just one guitar!)
Sue I'm intrigued, do you have a specific project in mind to use this radius dish jig?
+watchtheskies It's for my acoustic guitar build project
Check out how much a radius dish costs if you buy one online. Sites: LMII or StewMac (guitar making supplies). Cool how she can save money with a dyi approach.
why do you use you bench/table saw without a guard , when it's slightly less dangerous than sword swallowing with a running chainsaw ? I've watched two very bad accidents with a saw one the blade broke and the other ended up with all the tendons in the guys left hand being severed . I ask this because I see it all the time on TH-cam and if I had have done it at work the #### would have hit the fan .
+Andy Ward I prefer to be able to see what I'm doing (and I always wear eye protection and stand to the side of the cut). I find I have to set the blade higher with the guard because it's attached to the riving knife. I had the work get stuck under the guard once and it ruined the cut. I'm not sure if that's a bad design or whether you have to always make sure the guard is clear of the work, but I didn't like it
Guards on riving knives are always getting in the way. I am a safety freak with my saw, and even I take it off for most cuts except simple rips.
Just what do you use this dish for in instrument making?
Forgive my ignorance!
Peter Leonard The front and backs of acoustic guitars are domed. One uses the dish to sand the correct curve on the braces and then use it as a clamping caul
Nice work again. Where do you get your ply?
+Jon Allen B&Q. Not the best quality
Agreed. It just looked to be better than that on video.
+Jon Allen it was 'hardwood' ply, but it's really the same cheap board but with a thin veneer on the front. It is cheap though :-)
Maybe a better wood vice would help. Do you use Patreon?
+Michael Claussen I don't use Patreon yet. Maybe in the future
You are not going to win any compositions with those gloves?, but I know what you mean about superglue and hands. I a looking forward to the finished item because at the moment I am lost, but I am sure that it is just me being thick and not your videos.
+John Fithian-Franks it was actually the sandpaper I was protecting myself from - 60 grit rips through my skin. :-)
To see the finished dish you have to go to the previous video. A radius dish is used for sanding and clamping domed surfaces - in this case a guitar front/back - you'll see that in a few videos time.
Ma con 60euro lo compro già fatto mentre a farlo ne spendo 600...ma per favore
All that time spent watching you drill holes and screwing. And you spend less than 5 seconds on the actual calculation of the radius depth increments.