Bucyrus Erie crane truck

[Mikem]

So much to learn and figure out !

[JAMMER]

How are you planning to cut the swing gear, by broaching it?Ed

[Krewmember]

Yes the plan is to use broaching to cut the swing gear. I only have a lathe so I'm going to use a profile tool in a boring bar holder and just slowly scrape away until I get to the right tooth depth and since I'm using aluminum for the swing ring I should not have too much trouble. As for indexing. My lathe has a gear reduction that can lock the spindle, so I can just enable the gear reduction cut a tooth and then disable it go to the next tooth on the gear reduction or skip a couple to divide, that way i can use my lathe as a poor man's indexing head


The only reason I was planing to add a center shaft was for rigidity. As I do not know how tight I'm going to be able get the hook rollers. I will just have to see how it works when I machine the parts and do some tests.




Shawn

[sparkycuda]

Love this build! Just a clarification about the center shaft and hook rollers. Center shaft does transmit propell power to lower works, but the house is also centered by the bushing around the shaft housing. Hook rollers control the tilting of the house on the ring, so clearance is needed between rollers and ring path. Roller clearance allows front rollers to contact on bottom flange and rear rollers on top flange, when lifting. If they are adjusted in too far, lack of clearance will prevent rollers from turning during house rotation.

[Krewmember]

That makes sense. Thanks for clarifying that.

[Mikem]

So the rollers need enough clearance to roll but not to tight not to loose . Hmmmm

[sparkycuda]

Yes. When we adjusted hook rollers, we'd lay the boom straight out (sometimes with weight on it) to tilt house forward, then measure clearance at top of front rollers and at bottom of rear rollers. Since rollers are tapered, adding or removing shaft shims would push them toward or let them pull away from the center shaft, altering the clearance between roller and circle flange.

Ken

[Jared]

Originally Posted by sparkycuda

Love this build! Just a clarification about the center shaft and hook rollers. Center shaft does transmit propell power to lower works, but the house is also centered by the bushing around the shaft housing. Hook rollers control the tilting of the house on the ring, so clearance is needed between rollers and ring path. Roller clearance allows front rollers to contact on bottom flange and rear rollers on top flange, when lifting. If they are adjusted in too far, lack of clearance will prevent rollers from turning during house rotation.

Oops! My bad. I guess I've been away from it too long. Looking at my drawings I see I made provision for a center bearing.

[Mikem]

You have a drawing for this piece ? Would you share it ? Mike

[9W Monighan]

I've posted this in the past. Is this of any help? I have more if needed.