Hi Aram, Warning: I'm not a machinist by trade or CNC expert, so you better check other sources before you decide what you want to do.
[EMAIL PROTECTED] wrote: > hi > that shop makes bicycle wheel out off carbon fiber and all machining is in > trimming Extra stock of fibers, gives some shape to the ream where robber > That makes it much easier to solve your problem. Depending on your workspace and other parameters you need to decide which way the wheels will be positioned when worked on. Vertical would be my choice for two reasons. First, it takes less space then horizontal. Second, when in vertical position, you can spin it gently and see if it's balanced or not. While balancing is another matter altogether and can be done in horizontal position, that requires measuring equipment that's more expensive than simple free spin with a hand. Not having experience with T-slot aluminium I decided to order a few samples for a project recently. I wanted to see how strong in relation to weight those profiles can be. There are specs of course, but having things in hand makes it easier for me. What I found out is that I simply over dimensioned my project. Aluminum T-slots are very strong. They come in all kinds of forms and shapes so you would need to study which is better for you. There are many sources for this depending on where you live and how much you want to pay and how detailed the order is, i.e. depending on supportive components like screws, interlocking parts, etc. By now you must have figured that my suggestion leans towards T-slots. You can design the machine, equip it with motors, gears and other mechanics, electronics, and CNC software. If you find out that something doesn't work out the way you expected, you can reconfigure it relatively easy and inexpensively. Square T-slots with 40mm (1.5") per side should be strong enough for the main frame and smaller for other parts for what you are trying to do IMO. My initial setup would possibly look like a CNC machine with large spindle for the wheel in vertical position and horizontal slide going through the center for CNC controlled tool. You could spin the wheel by any reasonable speed to grind or cut off desired amount of material as in lathe. That would make the wheel balanced. On the other hand, if the wheel were under closely controlled slow spin, i.e. positioned under CNC, you could cut any kind of shapes in it. A relatively simple mechanism could be built to do both, Most likely, DC motor with servo control would provide most accurate spindle and wheel positioning in "design mode" and allow for relatively fast speeds as in "lathe mode". Spindle is perhaps the most critical part. It too could be built from T-slots but needs to be balanced for use in lathe mode. Depending on wheel types, spokes or not, and size, you would need to design some kind of a clamping mechanism that keeps the spindle balanced at all time. In it's basic configuration the described machine would require two motors under CNC control,. First one for the horizontal positioning of the tool, a cutter in lathe mode, or rotozip or some such in design mode. The second motor would be needed for the spindle. My estimation for the parts to build such a machine is under $2000. Alternative to the above would be to use a "classic" horizontal CNC machine for woodwork with spindle mounted on the flat bed and it's control added to the existing CNC system as 4th axis. Their cost depends on the size which in your case is rather large. > part will be attached latter. So I think that if some kind unit – spindle > with chuck of 20 inch where I can add spacers to the jaw be better thing. > it is very light cut machine. > Thank you > Aram > Let us know what you come up with. -- Rafael ------------------------------------------------------------------------- Check out the new SourceForge.net Marketplace. It's the best place to buy or sell services for just about anything Open Source. http://sourceforge.net/services/buy/index.php _______________________________________________ Emc-users mailing list [email protected] https://lists.sourceforge.net/lists/listinfo/emc-users
