> > Since you're going to machine the 'rack', the type of belt is no longer an > issue in terms of profile matching. > But the advantage of your choice of HTD is that all you'll need is a ball > nose cutter to machine a mating profile. >
Well, as I told Andy, I've been reading about the round profile benefits in backlash and torque delivery but I'm not sure how noticeable will be for my job. Anyway, if I go on with this approach I can select almost any profile. My idea for the "racks" is to make a fly cutter in the CNC lathe and then use the same lathe to fly cut the teeths, mounting the aluminum rack on a simple jig on the turret. > I was wondering what you're going to machine, and if it's boards, only > boards, and forever boards, then you don't need much of a throat on the > machine. (daylight).. Not to be confused with Z travel. > So, if the racks are say 80mm above the board, you could link the two drive > pinions directly to each other with a 40mm tube. And then drive this. Now > you will never have to worry about skewing of the axes, or dual homing. > About how to drive the gantry. I thought about that but given the design of my frame and how I'm building it, it's not gonna be possible to use a transmision. I've seen there's a gantry component ready to use in LinuxCNC, my plan was to use that or slave one motor as others did. I was thinking about using some laser cross of something to check for the squareness of the two axis. But I don't know how precise that could be, it's just a thought. > And I would think you'd want at least an 8M belt, 30mm or wider? I'm planning to use 50 mm wide belt, just to be sure. I'm overkilling it probably, but I prefer to be sure. El mar., 23 abr. 2019 a las 12:16, Leonardo Marsaglia (< [email protected]>) escribió: > You are looking at reducers on Aliexpress, so why not use T5 belt from >> the same source? Then you have the option of using the Servobelt >> system or something else? >> Incidentally, I have the correct gear hob for T5 timing belt so can >> tooth custom sprockets if that helps. >> https://www.youtube.com/watch?v=ltmZrDrt6pQ > > > Well I'm not sure at all wich profile suits me the better. I was thinking > about a round profile because I've reading about it's benefits but I'm not > sure how noticeable they are. > > I'll let you know if I need to machine the T5 sprockets. You have a really > nice setup (as always ha!) Thank you Andy! > > El mar., 23 abr. 2019 a las 11:33, Roland Jollivet (< > [email protected]>) escribió: > >> On Tue, 23 Apr 2019 at 15:16, Leonardo Marsaglia <[email protected]> >> wrote: >> >> > Well I think gluing a belt that long and wide with a proper jig or the >> > right equipment could be a pain in the ass so I'm thinking about what >> > Roland sugested. To machine the rack in wich the belt will be running. >> That >> > way I can guarantee zero strecth and perfect engagament. >> > >> > I plan to make the racks (I may be can call it linear pulley? or >> infinite >> > diameter pulley) out of 6061 aluminum. Then I can set them up like a >> normal >> > rack but with the benefits of the servobelt system. I know this is not >> the >> > quickest solution but I can machine the racks easily here in the shop so >> > that's not a big problem. >> > >> > I'm also thinking about using the loop servobelt setup wich I think it's >> > more convenient. Here's a picture of the setup: >> > >> > >> https://static1.squarespace.com/static/51396d24e4b01b4441c64c1f/51396d24e4b01b4441c64c2a/58f69bcff7e0ab3d0693dee9/1492556758738/2016-05-06+09.00.22.jpg >> > . >> > The only thing that I need to decide yet is the belt profile for the >> > system, since I don't need the belts to fit into each other I can make >> the >> > racks with any profile. I'm thinking about using HTD or GT2 but that's >> not >> > decided yet. >> > >> > >> Since you're going to machine the 'rack', the type of belt is no longer an >> issue in terms of profile matching. >> But the advantage of your choice of HTD is that all you'll need is a ball >> nose cutter to machine a mating profile. >> >> I was wondering what you're going to machine, and if it's boards, only >> boards, and forever boards, then you don't need much of a throat on the >> machine. (daylight).. Not to be confused with Z travel. >> So, if the racks are say 80mm above the board, you could link the two >> drive >> pinions directly to each other with a 40mm tube. And then drive this. Now >> you will never have to worry about skewing of the axes, or dual homing. >> >> And I would think you'd want at least an 8M belt, 30mm or wider? >> >> _______________________________________________ >> Emc-users mailing list >> [email protected] >> https://lists.sourceforge.net/lists/listinfo/emc-users >> > _______________________________________________ Emc-users mailing list [email protected] https://lists.sourceforge.net/lists/listinfo/emc-users
