The project I'm working on requires a 1:22 worm & wheel to transmit a little more than 60Nm torque at about 4RPM.
From what I've read, it seems that I need Mod2 or 12.7DP gearing to fit into the space available. Because the price of commercial items exceed my budget I've decided to make my own - by making a hob at the same settings as the worm, and using that to cut the wheel. The worm will be steel and the wheel, bronze or brass.
It appears that the Mod2 requirement is to satisfy the need for teeth strong enough to transmit the required torque. Since steel is rather stronger than bronze it seems to me that thick wheel teeth coupled with thinner worm teeth would be a better combination than teeth of equal thickness. Since I'm making a hob, could I not make the gaps bigger than the teeth, so that the teeth of the wheel turn out to be thicker than the gaps?
Or is my thinking wrong?
From what I've read, it seems that I need Mod2 or 12.7DP gearing to fit into the space available. Because the price of commercial items exceed my budget I've decided to make my own - by making a hob at the same settings as the worm, and using that to cut the wheel. The worm will be steel and the wheel, bronze or brass.
It appears that the Mod2 requirement is to satisfy the need for teeth strong enough to transmit the required torque. Since steel is rather stronger than bronze it seems to me that thick wheel teeth coupled with thinner worm teeth would be a better combination than teeth of equal thickness. Since I'm making a hob, could I not make the gaps bigger than the teeth, so that the teeth of the wheel turn out to be thicker than the gaps?
Or is my thinking wrong?