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 Simplicity Broadmoor R/S Project

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CraftsmanQuad19
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PostSubject: Re: Simplicity Broadmoor R/S Project    Simplicity Broadmoor R/S Project  - Page 4 Icon_minitimeThu Jan 09, 2020 6:43 pm

That was the biggest challenge for me. Finding a rack narrow enough with a center input that’s straight. Pretty tough to do really
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mr.modified
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PostSubject: Re: Simplicity Broadmoor R/S Project    Simplicity Broadmoor R/S Project  - Page 4 Icon_minitimeThu Jan 09, 2020 8:18 pm

My plan is to mount it centered and hooked to both wheels. It's not ideal that the shaft points towards the outside but luckily it's not by a lot. I may end up with 3 universals total. We'll see. I don't want to add a ton of weight with a super heavy steering shaft but small sized universals are available.

I think what I'm going to do is go the risky route of making the front end and frame and then dealing with the issue of going up over the engine. 99% sure that's where I'm gonna run it.

I looked through a lot of different racks but pretty much all of them have that offset to the outside.
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mr.modified
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PostSubject: Re: Simplicity Broadmoor R/S Project    Simplicity Broadmoor R/S Project  - Page 4 Icon_minitimeSat Jan 11, 2020 6:26 pm

Started mocking things up today to begin frame construction accoring to my drawing
Simplicity Broadmoor R/S Project  - Page 4 Img_7115

The frame is going to be a bit odd but it looks like everything will work out ok as far as I can tell
Simplicity Broadmoor R/S Project  - Page 4 Img_7116

This is a mock up axle I threw together so that I can bolt two wheels at 42" outside width
Simplicity Broadmoor R/S Project  - Page 4 Img_7114

I think the rack and pinion will need to go forward of the front axle center line and between the upper and lower control arms. I might be able to get away with only two u-joints in the steering shaft.
Simplicity Broadmoor R/S Project  - Page 4 Img_7117

That's the light weight plastic seat I'll be using. The transmission will probably be about this close to the engine, but there's some room to move things around a couple inches here and there if necessary. I decided to build a naturally aspirated engine and not go the supercharger route for now. One reason is I'm worried about running issues and not being able to tune it in time for the 2020 TTC. Another is I think I will have my hands full getting the steering and suspension done on this build as it is. So I will try to leave room for a supercharger later on, which shouldn't be an issue.

I have some spacers ordered for the front spindles to make things fit correctly, should be starting to do some actual welding on the front end soon.
Simplicity Broadmoor R/S Project  - Page 4 Img_7118
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muddstir
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PostSubject: Re: Simplicity Broadmoor R/S Project    Simplicity Broadmoor R/S Project  - Page 4 Icon_minitimeSat Jan 11, 2020 9:21 pm

Man I like what I see.
That looks like how I want to run my transaxle on my troy bilt build - if I'd ever get back on it.
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MightyRaze
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PostSubject: Re: Simplicity Broadmoor R/S Project    Simplicity Broadmoor R/S Project  - Page 4 Icon_minitimeSat Jan 11, 2020 9:31 pm

It does look intriguing.  Personally would run the engine a bit further forward?  But... I'm a heavier dude.

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mr.modified
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PostSubject: Re: Simplicity Broadmoor R/S Project    Simplicity Broadmoor R/S Project  - Page 4 Icon_minitimeSat Jan 11, 2020 11:02 pm

Thanks. And yeah it might go a bit farther forward but I don't know how much space I will have with the suspension. I will have a tiny bit of extra room with the rack and pinion in front instead of in back how I originally planned it.

Center of gravity will be a lot lower than the adventure edition and also, the trans being forward about 6-8" of the rear axle should help too.
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Creepycrawler
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PostSubject: Re: Simplicity Broadmoor R/S Project    Simplicity Broadmoor R/S Project  - Page 4 Icon_minitimeTue Jan 14, 2020 8:44 pm

Very cool start
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mr.modified
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PostSubject: Re: Simplicity Broadmoor R/S Project    Simplicity Broadmoor R/S Project  - Page 4 Icon_minitimeWed Jan 15, 2020 12:51 am

Thanks. I should have some more pics going soon and some actual fabrication in progress. Tonight I started figuring out the front end. The rack and pinion I bought does fit and could be made to work, but I have a cub cadet steering box that may be a nicer fit. I originally didn't want to use it, but it's a faster ratio than the rack too and might do a better job.

The rack and pinion is about 3.75 turns lock to lock, with the cub cadet box about 2.25ish if I remember right. I figure it won't be so good whipping the wheel like crazy on a short course if you need to also keep yourself on the machine by holding the steering wheel. The cub cadet box is actually a really simple screw setup with a pin. I expected it to be gears.

I need to lock down my plans before working on the frame since I want to incorporate the mounts for the steering in the right place.

Other minor plan alterations: Upper and lower control arms will probably be square tubing instead of round. I will need to make some tight bends and square will be easier to work with. Plus my heim joint weldable inserts fit nice into the square steel I have. I could not find the correct round tubing to make a snug fit.
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mr.modified
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PostSubject: Re: Simplicity Broadmoor R/S Project    Simplicity Broadmoor R/S Project  - Page 4 Icon_minitimeWed Jan 15, 2020 11:31 pm

Think I changed my mind again today so it's probably back to the rack and pinion. But anyway, here's some pics of the cub cadet steering box. I originally thought they were sealed, but not really. Still a very simple and rugged design. A disadvantage for this project is odd mounting angles. The rack unit mounts on a flat surface. Also I would have to modify it quite a bit.
Simplicity Broadmoor R/S Project  - Page 4 Img_7120

Here's the cover removed. A big bolt/stud is the pivot and a heavy duty pin which engages the screw.
Simplicity Broadmoor R/S Project  - Page 4 Img_7122

A close up of the screw. The silver boarder is actually a replaceable piece. Like a bushing sort of.
Simplicity Broadmoor R/S Project  - Page 4 Img_7123

Both of these are 1" box steel. The thin one on the right is 16 gauge. Same as most automotive exhaust pipe. That's what I used for the GTR 4 zero frame. On the left is what I'm using for all the main frame sections of the Broadmoor RS. I think it's called 11 gauge? Probably about twice as thick and much stronger. A little heavier of course. Outside dimensions are about the same, so I can use some of the lighter 16 gauge in some areas for bracing without adding the extra weight.
Simplicity Broadmoor R/S Project  - Page 4 Img_7119

Finally started on the frame tonight with the first two short pieces cut for the lower part of the forward frame. The lower control arms will bolt to those sections and also the steering rack will mount to it. I plan on tying the front end together with a sort of skid plate angled at about 45 degrees. Ground clearance on this thing will be somewhat less than what most off road tractors end up with, but not by much.

Just marked this out to show me where I marked things in case I can't remember when I get back to it again. The dot's are where I marked the steel sections I cut with a center punch. Didn't feel like having the sharpie rub off when I'm moving them around and measuring.
Simplicity Broadmoor R/S Project  - Page 4 Img_7121
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AllisKidD21
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PostSubject: Re: Simplicity Broadmoor R/S Project    Simplicity Broadmoor R/S Project  - Page 4 Icon_minitimeThu Jan 16, 2020 10:44 am

That's a Ross made steering box, I have a few tractors that use one. They're awesome for use in garden tractors and make for super nice steering, but I'm not sure how they would hold up to high speed off-road abuse. Rack and pinion might be a good option.

Looking forward to seeing the frame come together! The mock-up you did looks pretty neat.

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mr.modified
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PostSubject: Re: Simplicity Broadmoor R/S Project    Simplicity Broadmoor R/S Project  - Page 4 Icon_minitimeThu Jan 16, 2020 4:56 pm

Thanks. Your right about the box, I noticed it said Ross when I was cleaning some grease off of it. Pretty sure I'll go with the rack unit. I may attach the tie rod ends in a bit closer to the spindles to get quicker steering. Not 100% sure yet. Next step is the cut out a relief for the rack and pinion in one of the lower frame pieces and then weld some steel back in. Pics will explain better once I get it going.
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redzz02
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PostSubject: Re: Simplicity Broadmoor R/S Project    Simplicity Broadmoor R/S Project  - Page 4 Icon_minitimeThu Jan 16, 2020 11:17 pm

Very intriguing set up, loving the shiny wheels and I too would move that motor forward a little more, looking good

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mr.modified
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PostSubject: Re: Simplicity Broadmoor R/S Project    Simplicity Broadmoor R/S Project  - Page 4 Icon_minitimeFri Jan 17, 2020 12:35 am

Thanks. The wheels are from Northern Tool. I would move the engine farther ahead but I'm about at the limit of where I can move it with the suspension arms. Also the steering linkage from the rack and pinion needs to get up over the engine. Farther forward it is, the more angle there will be. I can also move the rear axle a few inches to shift weight distribution a bit. We'll see. I'll definitely be putting the engine as far up as I can.

Tonight's work on the lower front frame. They need to be close together to leave enough room for the suspension arms. But to keep them narrow and mount the rack unit where I want, I had some clearance issues. So had to cut out a notch.
Simplicity Broadmoor R/S Project  - Page 4 Img_7124

Clearance problem solved. Just need to weld it back up. Strength won't really be an issue as there will be a heavy mounting plate for the rack/skid plate welded under this area of the frame. Plus it's right up near the front.
Simplicity Broadmoor R/S Project  - Page 4 Img_7126

Cardboard template fit in.
Simplicity Broadmoor R/S Project  - Page 4 Img_7125

A dash to hood brace from my parts sears suburban happens to be the right size.
Simplicity Broadmoor R/S Project  - Page 4 Img_7128

Bent to the right shape...
Simplicity Broadmoor R/S Project  - Page 4 Img_7129

Fit in place.
Simplicity Broadmoor R/S Project  - Page 4 Img_7127

Welded. Still getting used to my new welder and I think it needed to be set a bit hotter. Got the job done but would have looked better if I had it burned in a bit more. Not a huge deal.
Simplicity Broadmoor R/S Project  - Page 4 Img_7130

Now the rack will fit flush with the bottom, which is where I need it to line up with the wheels. There's limited movement with the inner tie rod ends for suspension travel and I wanted to keep the bottom of the tractor as high as possible for ground clearance. So, it ends up that the rack needs to mount directly to the front skid plate.
Simplicity Broadmoor R/S Project  - Page 4 Img_7131

Ground clearance in the front will be about 7", the same clearance as the number 64 simplicity has under the transmission skid plate in the rear. If I weld the tie rod mounting points higher on the front spindles, I could pick the front end up a bit higher, but probably only about an inch more max. On the #64, I rarely hit anything, but then again, remember that when  the suspension compresses, you'll lose that much in ground clearance. To keep center of gravity down low, you'll need to compromise some clearance. To help the front end situation somewhat, I'll have a heavy steel skid plate attached under the rack unit, then forward to the front of the frame rails. There is will bend upwards at 45 degrees and the upper frame rails will tie into it.

Slightly less ground clearance is acceptable between the wheels. Because the wheels keep the machine up over most obstacles. Only very jagged rocks will contact the bottom between the axles. In the middle of the machine, the ground clearance needs to be a bit more. On the #64 the center clearance is between 10-11". On the broadmoor RS I was hoping for 9". The frame will need to be stepped up when we get back to the engine mounting plate. Once the front end is a bit farther along, we'll work our way back and sort that out.
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