Author Topic: Bruder Manitou 2150 - RC conversion  (Read 2755 times)

Offline ddmckee54

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Re: Bruder Manitou 2150 - RC conversion
« Reply #50 on: January 17, 2020, 04:36:00 PM »
Not a lot accomplished on THIS project during the past week.

My home cable modem puked on me sometime Wed. night.  The cable repair tech is scheduled for Monday, between 1 and 5PM.  This was the earliest I could get scheduled, wonder if I'll get compensated for the time that I've paid for but can't use due to their hardware failure?  (Not gonna hold my breath waiting for that to happen.)

Most of my software packages need to phone home to verify the licenses, so until that modem is replaced I'm pretty much screwed.  I hope to get the RC receiver patched into the Arduino breadboard and get some more work done on the code for the Nano - time will tell.

Don
Too many irons, not enough fire.

Offline WeldingRod

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Re: Bruder Manitou 2150 - RC conversion
« Reply #51 on: January 23, 2020, 09:59:07 AM »
Are you printing the ring gear for the turntable?  How about the bearing system?

I've used geared skewing ring bearings professionally, with a few curses due to me using them for things the manufacturer never intended;-)

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Offline WeldingRod

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Re: Bruder Manitou 2150 - RC conversion
« Reply #52 on: January 23, 2020, 09:59:38 AM »
Argh.  "Slewing" ring bearing.

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Offline ddmckee54

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Re: Bruder Manitou 2150 - RC conversion
« Reply #53 on: January 23, 2020, 01:02:53 PM »
WeldingRod:

For the gears I'm actually sorta taking the easy way out - maybe.

I ordered an assortment of 0.5 mod plastic "Robot" gears from Fleabay.  Or maybe it was Amazon - I don't remember which.  The gear assortment came in a variety of nominal bores, 2.0mm, 2.5mm and 3mm - along with a couple of pieces of 2.0mm and 2.5mm shaft stock.  I figured that a cheap injection molded gear would probably be better than anything I could print at that size.  I started with a 6VDC 100 rpm N20 gearbox and then geared that down so that I should get about 1-2 rpm out of the turret.  It's at least a 3 stage reduction, maybe  4, I can't remember - it's a Senior Moment type thing I guess.   I have the shell of the gearbox designed and I will be printing that.  The gear assortment had a couple of larger gears, 60 and 72 tooth.  I'll be using the 72 tooth gear as my final ring drive gear.  I have designed and printed the adapter parts the will allow my ring gear to mate up with the modified Bruder turret.  This all gets bolted together with M3 button-head bolts - courtesy of my 3D printer repair/modification parts.  The model originally had a gear drive steering mechanism that ran down through the turret pivot.  I was going to try to use it for the ring gear, but it was just too big.  Those gears did wind up in the "I can use this someday" box though.

The ring bearing, well that's kinda the same answer.

This model is made out of nice slippery plastic.  It's not styrene since it's not brittle, and I don't think it's ABS since it is somewhat resistant to acetone.  (Had to repair a  boo-boo with the X-Acto knife while dis-assembling the model.)  The model was designed to be turned by a kid - A LOT, and I figured that I'm not going to be slewing it THAT much.  Initially I'm just going to use the model's ring bearing as designed by Bruder.  If it starts to wear too much, of if there's too much friction for my homebrew gearbox to overcome, then  I'll have to come up with a proper ring bearing.  One that will work with my ring gear and still accommodate the slip-ring assembly.  The slip-ring assembly is about 13-14mm in diameter and its' got 12 circuits that are good for 250mA each. 

I'll try to remember to post an update of the 3D PDF either tonight when I get home, or tomorrow.

Don
« Last Edit: January 23, 2020, 01:41:27 PM by ddmckee54 »
Too many irons, not enough fire.

Offline WeldingRod

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Re: Bruder Manitou 2150 - RC conversion
« Reply #54 on: January 23, 2020, 10:38:51 PM »
Yeah, gears that small would be a major printing challenge!
Keep us posted!

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Offline ddmckee54

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Re: Bruder Manitou 2150 - RC conversion
« Reply #55 on: January 24, 2020, 11:37:44 AM »
Attached is the 3D PDF as it currently sits.  If you can open it, you can manipulate the viewing angle.  You can also turn bits and pieces of the PDF ON or OFF.

I haven't 3D modeled the entire Bruder model, just the parts that I've been working on.  I don't model any parts until I need to, makes working with the 3D CAD a little faster.

So far what I've been working on amounts to designing the following modifications:
1) The upper and lower frame halves.  Including determining what had to be amputated to fit the new axles, AND still be able to put the frames back together.  I'm trying to keep as much of the internal structure of the Bruder model as possible.  I don't want to compromise the strength of the model any more than I have to.
2) The front and rear axles.  I replaced the existing axles because the Bruder "suspension" was nothing more than allowing all the spindles to float up and down about 5mm.  My version has the rear axle fixed to the lower frame while the front axle can pivot about 5-10 up and down.  I will still be a rough ride, but it should keep all 4 wheels planted on the ground - MOST of the time.
3) I replaced the steering, the original Bruder steering had WAY too much slop in it.  It had to have slop in it due to their suspension.  Now the model should go the direction I want it to go, not just sort of in that direction.
4) I designed the axles around the N20 gearmotor, and modified original Bruder wheels.  This model will have 4WD from 4 wheel-motors, just like the real deal.
5) I found a home for an 8 channel RC receiver, that goes where the model's "engine" would be.  I can run the model on 6 channels, but I designed the changes around an 8 channel receiver.
6) I've designed the servo controlled 5 position switch and its' mounting bracket.  Although when I look at the PDF I see that I still need to find a permanent home for a pair of them.  I believe that I had planned on putting them in the upper frame, in the open bays next to where the outriggers mount.
7) I've got the slewing system designed, that required modeling part of the turret.  The slewing gearbox is the blue object sticking out the side of the model.  The area that it protrudes through, and into, is actually the "fuel tank" on the model.

Still to go, but probably all based on N20 gearmotors:
Boom lift mechanism - an N20 gearmotor with probably a 5mm or 8mm 3D printer lead-screw.
Boom extension mechanism - ditto on the gearmotor/lead-screw.
Fork tilt mechanism - ditto on the gearmotor/lead-screw.
Winch mechanism - don't know, maybe start with one of the 3D printing pen worm drive gearboxes used for filament feed?

That's enough Yakking for now,
Don
Too many irons, not enough fire.

Offline Will_D

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Re: Bruder Manitou 2150 - RC conversion
« Reply #56 on: January 25, 2020, 04:36:56 AM »
Really looking forward to the video at the end of this. Amazing level of detail and info in all your posts.

Always wanted to make a large Groves-Cole mobile crane in Meccano. It was the biggest at the time 450T lift, and about 8 axles. Scale was based on the largest roller ring bearing you could builds out of (iirc) the 6" ring girders and blue circular plates.

That was built and I still have it some where and also a bag of suitable tires. That's as far as i got
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Offline ddmckee54

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Re: Bruder Manitou 2150 - RC conversion
« Reply #57 on: February 19, 2020, 05:45:02 PM »
No progress on the project in the last month.  I've been buried with the demands of the day job, we're going to be tearing out 2 existing production lines and installing 2 new lines.  The next couple of weeks don't look any better - actually worse.  I try not to bring the work home with me, but for the last week I haven't had a choice.  I already know what I'll be doing THIS weekend, and relaxing is not an option.  Once we get the electricians and systems integrators cut loose on this project the hardest part for me is over, then all I've got to do is ride herd on them so THEY stick to the schedule.

I'll get back to this project when I'm not so completely fried from work that all I want to do is sit down and veg-out.

Don
Too many irons, not enough fire.