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convex curve cutter

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Forum topic by shinndog posted 02-13-2018 01:13 PM 710 views 0 times favorited 9 replies Add to Favorites Watch
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shinndog

6 posts in 2473 days


02-13-2018 01:13 PM

bought a convex curve cutter at Tampa woodworking show in January of this year. Having a problem in using this piece of equipment. any one have one that can help please help!!!!!


9 replies so far

View John Smith's profile

John Smith

1361 posts in 306 days


#1 posted 02-13-2018 01:54 PM

is this it ?

http://www.convexcurve.com/band-saw-tool.html
http://www.convexcurve.com/

-- I started out with nothing in life ~ and still have most of it left.

View WyattCo's profile

WyattCo

93 posts in 247 days


#2 posted 02-13-2018 02:00 PM

I saw one of these at a show a little while back. The concept is solid but the jigs design is in dire need of work. Waaay to much room for error.

What kind of problems are you having?

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johnstoneb

3011 posts in 2316 days


#3 posted 02-13-2018 02:43 PM

Wouldn’t a convex curve cutter also be called a circle cutter?

-- Bruce, Boise, ID

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shinndog

6 posts in 2473 days


#4 posted 02-13-2018 04:10 PM

john yes that is the one
fthis they showed how to cut convex then the off fall cn be used to make concave not such luck
Bruce no

View Loren's profile

Loren

10477 posts in 3791 days


#5 posted 02-13-2018 04:16 PM

That’s the sort of niche tool where I expect
you’d be able to write or call the inventor
and get some answers.

View jerryminer's profile

jerryminer

944 posts in 1584 days


#6 posted 02-14-2018 07:09 AM



Wouldn t a convex curve cutter also be called a circle cutter?

- johnstoneb

Yes, that device looks pretty much like a circle-cutting jig with some additional work-holding devices.

OP—I only know what I saw on the video that John linked to above, but the process looks pretty straight-forward. It seems to me that the off-fall from the convex cut, if thick enough, could be mitered and joined into a concave-sided box. What trouble are you having? (“No such luck” doesn’t tell us much)

-- Jerry, making sawdust professionally since 1976

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shinndog

6 posts in 2473 days


#7 posted 02-14-2018 12:10 PM

Jerry i made the box the same size as the manual that came with the cutter,iv’e made and cut 5 boxes and cannot get all the same size off fall. I was hopeing some one on this forum had one and could help me thanks Harold

View therealSteveN's profile

therealSteveN

1407 posts in 717 days


#8 posted 09-15-2018 08:45 AM

I don’t have one, as a matter of fact, just got a sales flyer on it, and was Googling for more info. Know this the guy doing the show, or making the video is going to gloss over info to make this look like it can sing and dance.

But if you set this up as they suggest, and use a box of prescribed sizes, the one on the video has very thick sides, they look like they are at least 6/4 material, what will be most important here is all 4 sides must be identical thicknesses, and laid out precisely so you know the same exact distances on all 4 sides.

Now the part they gloss over is that all must be real close to exact, the layout part. Failure to do so will get you slices coming off that vary in size. Those will not match up to be the concave box you want.

So it is very careful layout. Followed by very careful start of each and every cut to be right on your planned out cut line, and your cut radius MUST fit between lines you have drawn out.

Next is clamping it all still so the act of cutting does NOT allow any movement whatsoever. It has already been mentioned the heft of this design is for really inexpensive plastic mold injected parts, that can, and will flex if pressure is put on them. So I agree, it really isn’t very robust.

I’ve decided to use curve templates to be printed to Velum, or plastic. There are many templates to use out there.

The template looked like the strongest piece of that jig. It can’t be ruled out your problem is caused by the cheesy nature of that jig. But I honestly feel if you have tried several times, that careful layout is not being done on your part, because if it didn’t move, that is the only explanation for why your sides differ.

If in fact they were the same exactly, this says you could miter the offcuts to make the inverse box. BTW this is from a book written in the 50’s. But that concept is from early in time.

-- Think safe, be safe

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therealSteveN

1407 posts in 717 days


#9 posted 09-15-2018 08:47 AM

Because Peachtree just sent a mailer on this jig. I posted this so anyone else looking for “other info” might see this thread, and know, as I just figured out, using the templates in my link, and a circle cutting jig, with a sturdy clamping system will save you a lot of cash, and get you a better product.

-- Think safe, be safe

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