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By Chris152
#1313041
3041_l.jpg

It's a wax comb, I guess about 15cm long and about 5mm thick. If it's cut with CNC, is there a way to do the teeth efficiently and accurately (I'm thinking jig to compensate for ham-fistedness) by hand/ bandsaw? The teeth need to be sharpish.
Any ideas?
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By Myfordman
#1313048
Easy enough to mass produce with a comb joint cutter on a spindle on a chunck of timber and then slice into 5mm thick slices

As a one off? not so easy.
By Chris152
#1313052
Ah, right, makes sense. You can't get those for a router to use in a router table, can you? Would it need to be too long?
By Chris152
#1313090
On comb joint cutter I found these:
Comb-Machine-Joint-Board-Import-Alloy-Steel.jpg

Certainly don't have the kit to run those;
and
750px-FingerJoints.png

not deep enough and can't find it in the UK.

To do the cuts with a scroll saw, would you use a jig to get cuts parallel? And what's a reasonable depth to cut on a scroll saw - could you do a few 5mm thicknesses together? (I've never used a scroll saw.)
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By Inspector
#1313097
A good saw sharpener could regrind/re-tooth a table saw blade(rip) to cut a single V notch. You would then have to move the comb over finger joint style to cut the rest. Not worth it to make one but for small batches good. For large scale production it is shaper time.

Pete
By novocaine
#1313116
combs are normally stamped out (big scary funny bladed guillotine) or comb cut as suggested, when mass produced.
no chance you are going to cut it with a comb cutter over more than 1" of width so that's out (home shop).
scroll saw, you could stack maybe 3 at a time and with a bit of practice you'll be close to accurate (certainly enough for a wax comb). I might have a go with some scrap if I get chance in the shop this week to see how it goes.
you could do the say with a fret/piercing saw and a pin, it's going to take you a while but it's doable.

If you want to improve accuracy make a pin jig (like you'd use for bookcase shelf pins but smaller) and drill the bottom of each tine with a small hole to give you a target.

theres a guy in cornwall (can't remember where I saw him, it might of been Bude) that makes them from driftwood and skateboard decks (1 comb, both materials) that cuts them by hand, he has bigger teeth to make it a bit easier), think they were about a fiver when I saw them. oh, the point of this story, he uses a zero set saw (like a flush cut) and a metal guide to get it accurate.
By Chris152
#1313247
Inspector - so far I've avoided table saws almost completely, I reckon cutting individual teeth would be challenging for me (just the noise of the teeth cutting through the air in the workshop worries me!).

novocaine wrote:combs are normally stamped out (big scary funny bladed guillotine) or comb cut as suggested, when mass produced.
no chance you are going to cut it with a comb cutter over more than 1" of width so that's out (home shop).
scroll saw, you could stack maybe 3 at a time and with a bit of practice you'll be close to accurate (certainly enough for a wax comb). I might have a go with some scrap if I get chance in the shop this week to see how it goes.
you could do the say with a fret/piercing saw and a pin, it's going to take you a while but it's doable.

If you want to improve accuracy make a pin jig (like you'd use for bookcase shelf pins but smaller) and drill the bottom of each tine with a small hole to give you a target.

theres a guy in cornwall (can't remember where I saw him, it might of been Bude) that makes them from driftwood and skateboard decks (1 comb, both materials) that cuts them by hand, he has bigger teeth to make it a bit easier), think they were about a fiver when I saw them. oh, the point of this story, he uses a zero set saw (like a flush cut) and a metal guide to get it accurate.


I've had to look up four terms just to try to keep up with that post!

The handmade ones in Cornwall sound interesting and possibly do-able by me - the guide would be like one of those magnetic dovetail guides you can buy but at a steeper angle?
If you do get a chance on a scroll saw it'd be good to know how you get on.

hmmm...
https://www.alibaba.com/product-detail/ ... 2228q6nCKi
!
Last edited by Chris152 on 14 Oct 2019, 16:58, edited 1 time in total.
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By ColeyS1
#1313255
I was thinking about this yesterday and figured if I was going to do it I'd probably use the bandsaw and a jig.

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By Chris152
#1313261
ColeyS1 wrote:I was thinking about this yesterday and figured if I was going to do it I'd probably use the bandsaw and a jig.

I searched yesterday and found a jig used for making wooden combs (like the one used here at 1'19": https://www.youtube.com/watch?v=BTxY4ljMBn8) - it's like the ones used for making box joints on a router or bandsaw. I wondered if you angled the jig to cut one way, then used another angled the other way, it'd work.
By Inspector
#1313271
I could joke and tell you to use ear plugs and ear muffs so you don't hear the table saw blade but if you aren't comfortable with it then you shouldn't use one. They are one of the most versatile machines in the shop and I wouldn't be without one. Actually I have two. :roll:

There is an expensive option that would be perfect for doing that kind of work and doesn't have a noisy blade or motor for that matter. It was originally made by Bridge City Tools but has since been sold to Harvey Tools in China. They are sold here by Lee Valley and there may be a seller in the UK you could turn to if you wanted to go that route.

https://www.leevalley.com/en-ca/shop/to ... tmaker-pro

Here is a video Bridge City did when they came up with the tool.
https://www.youtube.com/watch?v=3ruwZdaPjbs

Pete

Added. https://harveymachinery.com/bctw/jointmaker-pro/

Axminster sell some of their tools and might bring them in if asked.

https://www.axminster.co.uk/bridge-city
By Chris152
#1313278
Amazing piece of kit - if only they'd move the decimal point on the price one place to the left! I wonder if you could make a version of that with just two angled settings for simplicity. Definitely worth a go!