Globe motor mounting

[Al Skierkiewicz]

I always thought a broach was something you used to finish what was already roughed in. (i.e. an edm or wire operation needs to be finished with a broach to make it smooth and accurate.) Any professional machine ops out there to answer?

[sanddrag]

Originally Posted by Al Skierkiewicz

I always thought a broach was something you used to finish what was already roughed in. (i.e. an edm or wire operation needs to be finished with a broach to make it smooth and accurate.) Any professional machine ops out there to answer?

I am no professsional machinist but I have done keyway broaching. It is basically a "staircase" of cutting edges and with each "step" it takes off a little more material. For the keyway, you start with the round bore, but the broach does the entirety of the slot. They have hexagon broaches too. You start with the round hole and on the broach may be like a foot long and on each step the cutter gets a little larger and a little more hex shaped and by the time it gets all the way through you have a full hex. I really thought there were Double D broaches, but I could be wrong.

[ChrisH]

Originally Posted by sanddrag

I am no professsional machinist but I have done keyway broaching. It is basically a "staircase" of cutting edges and with each "step" it takes off a little more material. For the keyway, you start with the round bore, but the broach does the entirety of the slot. They have hexagon broaches too. You start with the round hole and on the broach may be like a foot long and on each step the cutter gets a little larger and a little more hex shaped and by the time it gets all the way through you have a full hex. I really thought there were Double D broaches, but I could be wrong.

There are various kinds of broaches. We have one that was specially purchased to make a hole that fit the old Van Door motor shaft. Our sponsor provided it, so I have no idea how much it cost. I'm not sure whether or not it will fit the new Slider motor, though the output shaft is obviously different. Our sponsor also has a set of key way broaches which we have used occasionally. They all work as sandrag has described

[ArrBeeBee]

hey I was just wondering, how, exactly, did you guys get the sprocket to fit with the globe motors, like did you guys use hub or hubless sprockets? Thanks.

[Josh Siegel]

I used the globe motor like a lathe and turned it down... Hooked it up to a 12V, put the gearhead in a vice, and held a file against it. It fits an FP pinion now, but sadly its too small due to some smoothing files that probably shouldn't have been made. Epoxy stripped twice, what do you think about JB weld on the armature? Would it hold? I cant see easily putting a pin into the FP gear without screwing up some teeth bigtime.