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| Cutting a flat spiral gear / grinder pattern. |
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| NeoTech:
So, this is just for being able to cut more complex things. As a manual machinist im facing a problem down the road, i need to cut spiral pattern on a flat pice of stock, similar to a spiral bevel gear but no bevel. This would work if i could synchronize my linear travel of the table with the rotation of a roundtable. This could prob be solved in two ways. either slaving the roundtable somehow to the tables "turning" mechanism, through some gearing or shaft.. Or electronicaly with a positionining device and a stepper motor im guessing.. Anyone done this type of cuts before? (this type of gear is common in rear axles for the differential drive). |
| awemawson:
Conventional way was to gear a dividing head to the travel of a milling machine. Cincinnati published a very nice blue bound book described the hows and what's of the process Andrew |
| John Stevenson:
Be very afraid. The gearing of the table to the rotary axis is only part of it. The tools uses and the way they are applied is a far greater problem. Do a search on Youtube for Gleason Spiral bevel to see what you are faced with |
| NeoTech:
John Stevenson, checked the tube for what you suggested, and thats a modern way of making a spiral bevel gear. Now lets step back, i want to cut each groove, one at a time by the means of a single point tool or an endmill. =) The old way of gearing the round table to the travel of the mill table is a bit trickier. I have seen some weird ass badly illustratated instructions for it in a photocopy for my aciera milling machine. But it made use of a custom gearbox and alot of other hassle. The same technique is actually used for cutting a spiral on a piece of round stock as well. The math of spiral interpolation on a flat surface suggests that the linear travel synchronized with the turning of the round table would create radius rather than a straight line. When cutting that with a end mill you would end up with a groove, offset the workpiece a set amount, return to zero and then cut the next groove.. *googling cincinnati blue bound books now* =) |
| NeoTech:
this is what i wanna acomplish, but not using a cnc .. =) And this is the principle.. just trying to figure out how i do that with a round table. ;) |
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