On Wednesday 21 September 2016 01:15:54 Chris Albertson wrote: > Actually drilling the timing belt is not a bad idea. The older MXL > type belts used a trapezoid tooth belt but the new high torque "HTD" > Designs use circular profile teeth. They really are bater and > transmit more torque with less belt tension required. Even newer > designs are GT2 and GT3 and they use circular test also. It seems > counter intuitive at first that round teeth would hold more force. > But the load is more distributed the the tooth profile lack street > concentrators (corners) Any new design should be using g the HTD or > newer profiles > > This is the tooth design I was thinking of when I said "ball end" > mill. > > While on the subject I found a neat program that will let you design > almost any kind of gear (yes ANY kind, even non-round ones) then then > it creates G-code to make it. > http://www.gear2motion.com > I've not used it myself and likely will not as it seem to run only in > MS Windows.
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And on checking, the license is $120 USD. You can dl either version for free, but I'd expect without the license, it can't save or generate the gcode. It didn't say whats disabled in what I read, so thats a swag. Given the usage I might use it for, I think I'll pass. I have a alu bar headed this way to make that special hub I need from, and I have the gear I'll bore to a pressfit on this hub, on hand allready. After the x is running, next is little connectors to couple the ends of the bellows type screw covers for the z screw. Probably with 4 different treatments to the flange. Its hanging there now with paper towels draped over it. > On Tue, Sep 20, 2016 at 2:20 PM, Martin Dobbins <tu...@hotmail.com> wrote: > > Gene wrote: > > >The ball end wouldn't be the tool for the job as the bottom of the > > > gullet > > > > has sharp corners except for the OEM belt of a 7x12. And there >are > > 2 common face angles in >use and I've not the memory to quote > > whether its 14.5 degrees or 20 degrees for the face angle per belt > > tooth style. > > > > >Bigger than xl is probaqbly 20 degrees but that leads to belt > > > hopping if > > > > not tighter than a drum so I'd assume its 14.5 on the xl as they > > will rip the teeth off the backing >before they'll hop a tooth, > > assuming the shaft centers can't flex. > > > > Absolutely no experience with timing pulleys here :-), and of course > > from that perspective it's always "how hard can it be?" > > > > No cnc abuse in this video just a lot of old British iron, but where > > do you get the tooth profiles from? "You can see the belt > > manufactures details or get the profile for the cutter by curving > > the belt to the required diameter.?" (from the comments below the > > video) > > > > https://www.youtube.com/watch?v=kCiujbcrQzc > > > > This fellow just drilled some holes, but since he glibly points out > > that in his case it was pure math to decide drill size and spacing, > > it *must* be OK. > > > > https://www.youtube.com/watch?v=vJaacHN-A0Y > > > > I posted this without a thought to the serious matter at hand, and > > just hope it brightens up your day. > > > > Martin Thanks Chris. Cheers, Gene Heskett -- "There are four boxes to be used in defense of liberty: soap, ballot, jury, and ammo. Please use in that order." -Ed Howdershelt (Author) Genes Web page <http://geneslinuxbox.net:6309/gene> ------------------------------------------------------------------------------ _______________________________________________ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users
