Bucyrus Erie crane truck - Page 3

Panther F · #1 11-25-2017, 09:05 AM

Sweet, I really like these purpose built cabs like the COE & CBE. Much more appealing than a kit body.

Hope that pulley finds it's way to you. It really grinds a project to a halt when you cannot use that special tool.

Krewmember · #2 11-26-2017, 08:04 PM

Quote:

Originally Posted by skeeter

This is a really kewl build! I can't wait to see vids of it working.

Thank you. I will be sure to take plenty of videos when I get it operating.

Quote:

Originally Posted by Mikem

Your coming along faster then my parts . I’m still trying to find sizes for the crane body . Looks great

What type are you planning to model, 22B? if so 9W Monighan shared some scans from a 22B manual here.
http://www.rctruckandconstruction.com/showpost.php?p=47280&postcount=14

They helped me get the scale on my crane housing pretty close.

And if you need reference photos, I have a small collection of photos I have saved from the web on my computer. Also if you use Sketchup I would be more then happy to share my design file.

Quote:

Originally Posted by Panther F

Sweet, I really like these purpose built cabs like the COE & CBE. Much more appealing than a kit body.

Hope that pulley finds it's way to you. It really grinds a project to a halt when you cannot use that special tool.

Funny story. I actually got on ebay shortly after posting the update, and was
shocked to find that the exact pulley I have been trying to find for almost a year just got listed on ebay, let's just say that was the fastest ebay purchase I have ever made!

Shawn

egronvold · #3 11-27-2017, 02:22 AM

Impressive styrene-work.

Mikem · #4 11-27-2017, 07:31 AM

Thanks for the info Shawn . Went and quickly looked at the site . And I don’t have sketchup . I will plod along . Mike

Mikem · #5 12-04-2017, 07:37 AM

Hi Shawn what are planning on using for a swivel on the crane house

Krewmember · #6 12-04-2017, 12:37 PM

The plan is to get the swing mechanism as close to the real machine as I can. So I'm going to machine a custom swing ring and cut internal gear teeth in to it just like the deal.

Here is a diagram of what I have been able design based on what information I have.

The ring will be mounted to a base by bolt holes tapped in the ring, the base will have the bearings for a central shaft that will be mounted to the crane frame. The frame will have rollers that go inside the race in the ring, like this.

Shawn

Mikem · #7 12-04-2017, 01:32 PM

This is interesting the ring mounts to the truck then the wheels are mounted to the crane and support the weight of the crane ? Is there a center pivot ?

Jared · #8 12-04-2017, 10:29 PM

Cool! I'm planning to do the same thing on my 25B when I get back to it. I have a shaper I plan to use to cut the gear teeth- after I get it running, that is. How will you cut the teeth?

I don't think the center shaft does anything to keep the house centered on the swing circle; the hook rollers do that. As far as I know, it is just a way to transmit power down to the tracks. I wouldn't get too worried about building that part into your machine. Before hook rollers came along, cranes had upper and lower rollers to support the weight of the house and the center shaft did double duty as power transmission and keeping the house from falling off the circle and my understanding is it was nothing but trouble.

Mikem · #9 12-05-2017, 06:40 AM

So much to learn and figure out !

JAMMER · #10 12-05-2017, 10:49 AM

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

Krewmember · #11 12-05-2017, 01:50 PM

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 · #12 12-05-2017, 02:47 PM

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.

markturbo · #13 12-12-2017, 12:35 PM

Nice work! I like seeing these scratch built projects come to life.

Krewmember · #14 12-12-2017, 04:27 PM

Quote:

Originally Posted by markturbo

Nice work!

Thank you.

I had some free time over the weekend and I was able to the roof hatch on the crane housing done.

On a side note. I got the lathe running and bought a quick change tool post, so now all I need to get is some tooling and a drill chuck and center, and I will be able to start machining the swing ring.

Shawn.