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Bobcat  > Skid Steers  > Building my bobtach  
 
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 Author Thread: Building my bobtach
renopker is not online. Last active: 7/13/2014 7:44:09 AM renopker
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Building my bobtach
Posted: 03/10/2012 06:48 PM

Finely got to get going on it today,heres the progress Im using a tach adptor plate as a lay out fixture.

 

renopker is not online. Last active: 7/13/2014 7:44:09 AM renopker
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Re: Building my bobtach
Posted: 03/10/2012 06:48 PM
Tazza is not online. Last active: 10/21/2014 2:40:44 PM Tazza
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Re: Building my bobtach
Posted: 03/11/2012 02:34 PM

Oh, i never knew you were going to build the bobtach too, very nice! You must have access to some bad a$ gear to bend that plate, i want itSmiley

Are you keeping the pivot points the same as the dealer? I found that the bushings are a little thin and when i did mine, i made the wall thickness of the bushings at least 1/8”, possibly even thicker. This way they will take a lot more wear before they damage the boss. They were also out of 4140 and nitrided, so very hard surface, but soft centres.


Bobcat 763 burntSadbut i'm working on it!, 04 S150 with air and a smooshed cab, S250 turbo.
renopker is not online. Last active: 7/13/2014 7:44:09 AM renopker
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Re: Building my bobtach
Posted: 03/11/2012 04:09 PM

Todays progress,  Tazza the pivots will be at the same point as the OEM but do to the dual cylinders the bob-tach is more like the larger machines or S100s. I'm using the OEM bushing as well I don't for see wearing them out in my life time.

 

7LBSSMALLIE is not online. Last active: 10/13/2014 7:42:15 PM 7LBSSMALLIE
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Re: Building my bobtach
Posted: 03/11/2012 06:11 PM
why? parts are reasonable. i suppose if i could i would.but if you get it out o whack youre buying booom arms. and tilt rods, just the same i am impressed loooks good, make 200 of them .
renopker is not online. Last active: 7/13/2014 7:44:09 AM renopker
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Re: Building my bobtach
Posted: 03/12/2012 06:10 AM
Get it out of wack???
slik rik is not online. Last active: 4/26/2014 6:51:59 AM slik rik
Joined: 17 May 2011
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Re: Building my bobtach
Posted: 03/12/2012 01:52 PM

Nice fab work there, looks good. Hey what ever happened to that dump trailer you teased us with a while back?

 

Oh and your other posts on this rebuild are very nice also. Wish I had a large shop ......to fill with tools........hehehehe.....oh and hide from wife and kids

renopker is not online. Last active: 7/13/2014 7:44:09 AM renopker
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Re: Building my bobtach
Posted: 03/12/2012 04:26 PM
I put it a side to work on my truck, (11 months)  and with the 60-70* weather its giving me a jump start on finishing this bobcat.Off subject and not skidsteer This is my last project.http://www.youtube.com/watch?v=StJzGum4qsE&feature=channel
Tazza is not online. Last active: 10/21/2014 2:40:44 PM Tazza
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Re: Building my bobtach
Posted: 03/12/2012 05:51 PM

Holy crap! I'd never even touch a job like that.

Yep, you have a tool shop that i really want. Goad you have found the time to fit jobs like this in. Just how many hours did you put into it? I sure adds up quickly. I know when i rebuilt my 743, i spent countless hours at the lathe machining new pins and bushings, but the end result was totally worth the time.


Bobcat 763 burntSadbut i'm working on it!, 04 S150 with air and a smooshed cab, S250 turbo.
slik rik is not online. Last active: 4/26/2014 6:51:59 AM slik rik
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Re: Building my bobtach
Posted: 03/12/2012 05:57 PM
Any one can have the tools, you my friend know how to use em' wow....
renopker is not online. Last active: 7/13/2014 7:44:09 AM renopker
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Re: Building my bobtach
Posted: 03/17/2012 06:13 PM
Todays work, tacking and fiting
Tazza is not online. Last active: 10/21/2014 2:40:44 PM Tazza
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Re: Building my bobtach
Posted: 03/18/2012 02:57 PM
Looking good! Sure makes a difference when things start going into place.

Bobcat 763 burntSadbut i'm working on it!, 04 S150 with air and a smooshed cab, S250 turbo.
renopker is not online. Last active: 7/13/2014 7:44:09 AM renopker
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Re: Building my bobtach
Posted: 03/24/2012 06:12 PM

Little update as to my progress

 

renopker is not online. Last active: 7/13/2014 7:44:09 AM renopker
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Re: Building my bobtach
Posted: 03/24/2012 06:14 PM
one more
Tazza is not online. Last active: 10/21/2014 2:40:44 PM Tazza
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Re: Building my bobtach
Posted: 03/25/2012 04:49 AM
I like the way you lined up the ram pin bosses. This is how i'm going to line bore my lift arms, they are worn and need bushings installing, naturally they are not made like this from factory.

Bobcat 763 burntSadbut i'm working on it!, 04 S150 with air and a smooshed cab, S250 turbo.
renopker is not online. Last active: 7/13/2014 7:44:09 AM renopker
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Re: Building my bobtach
Posted: 03/25/2012 06:29 AM
At this time it was to locate the inboard plates for welding, as soon as the plates are welded I will then put in the pivot pin bushings.So until the welding on the tube and plates is done I float the weld in bushings until last.I was going to do the pivot pins the same way but decided to use the same stock ( 2.25X.375 wall ) bore each end and part  half way through it, weld it in then cut it at the parting line with the saws all.
Miker67 is not online. Last active: 9/15/2014 7:48:08 PM Miker67
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Re: Building my bobtach
Posted: 03/25/2012 08:25 PM

First off, man, your doing a wonderfull job.  Many DIY projects are of questionable quality sometimes, but that things looks like something anyone would be proud to have on thier machine.

Second, I am curios what manner of tooling you used to bore the holes.  I am doing similar projects and presently I use a mag drill with carbide annular cutters, though I am looking at switching out to a boring bar in a mill type setup.  I am curious what equipment you use.

 

 

6brnorma is not online. Last active: 10/5/2014 5:39:52 AM 6brnorma
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Re: Building my bobtach
Posted: 03/26/2012 06:06 AM
Wow.......I know a couple of people that do this kind of work, but I ain't it. Wish I was! That engine was unbelievable.......thanks renopker.
renopker is not online. Last active: 7/13/2014 7:44:09 AM renopker
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Re: Building my bobtach
Posted: 03/26/2012 06:14 AM
Thanks, The parts were all drawn in a cad cam program and cut out on a plasma so the holes were cut out at the same time. Drilling the holes with a mag drill works fine just remember to make the holes bigger to allow for welding warping and movement. That allows for floating the part (bushing).
shawn macananny is not online. Last active: 12/28/2013 8:07:31 AM shawn macananny
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Re: Building my bobtach
Posted: 03/26/2012 01:57 PM
I was really impressed with the bobtach then i watched your video for your Cummins engine. You are incredible. That's all i can say.
wings5j is not online. Last active: 10/4/2014 2:30:24 PM wings5j
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Re: Building my bobtach
Posted: 03/26/2012 03:08 PM

Yes, showing the steps in building the Bobtach are great but I too appreciated the link to the engine building project.

On a positive note, I think I will have my wife watch so that she sees how much my shop is really lacking. ;-)  I still do all of my cutting with an oxy/acetelyne set-up or bandsaw or chopsaw.

Thanks,

John


John 1993 742B
renopker is not online. Last active: 7/13/2014 7:44:09 AM renopker
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Re: Building my bobtach
Posted: 03/26/2012 04:45 PM

Nothing wrong with a torch grinder,chop saw and saws-all ,been there done that. Heres todays  progress # is of the bored tube in place & welded,

renopker is not online. Last active: 7/13/2014 7:44:09 AM renopker
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Re: Building my bobtach
Posted: 03/26/2012 04:48 PM
Cutting the tube out with the saws-all 
renopker is not online. Last active: 7/13/2014 7:44:09 AM renopker
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Re: Building my bobtach
Posted: 03/26/2012 04:54 PM
Tazza is not online. Last active: 10/21/2014 2:40:44 PM Tazza
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Re: Building my bobtach
Posted: 03/26/2012 05:50 PM
Nice job, the way i did mine was slightly different. I had to cut those bosses out as they were really worn. I made new ones and installed everything including the pins in the arms, the pins held the bosses straight, i then welded the bosses into place. The pins did a good job holding the bosses straight. They did move a little bit when i took the bobtach off and welded around the ends to give it a good join. Taking a little off the bushings fixed the small amount of binding it had. I think i left my tollerences too tight in the first place, not allowing quite enough clearance for the grease, i think it was only .005 to .008”

Bobcat 763 burntSadbut i'm working on it!, 04 S150 with air and a smooshed cab, S250 turbo.
renopker is not online. Last active: 7/13/2014 7:44:09 AM renopker
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Re: Building my bobtach
Posted: 03/26/2012 06:08 PM
So you used the arms as your fixture,  no set rule I like the long bar on short bushings. The interesting thing is when I cut through there was no binding and no movement I was a pleasantly surprised as well.
Tazza is not online. Last active: 10/21/2014 2:40:44 PM Tazza
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Re: Building my bobtach
Posted: 03/27/2012 03:29 PM

Yeah, i found it did work pretty well, but if i was able to do a full length like yours, i can see it holding up a little better as it would have held while i did my final welds that made it twist slightly.

Its a great feeling when you put things together after a big weld and they still line up as they should. Too often they move just a little too much.


Bobcat 763 burntSadbut i'm working on it!, 04 S150 with air and a smooshed cab, S250 turbo.
renopker is not online. Last active: 7/13/2014 7:44:09 AM renopker
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Re: Building my bobtach
Posted: 03/28/2012 05:33 PM
Finished the bobtach today  It will be sand blasted and powder coated as soon as I get the cylinders modified, still need heat treat the wedge pins as well.
Tazza is not online. Last active: 10/21/2014 2:40:44 PM Tazza
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Re: Building my bobtach
Posted: 03/28/2012 08:14 PM
I like your table. Sure would save the back on a lot of jobs.

Bobcat 763 burntSadbut i'm working on it!, 04 S150 with air and a smooshed cab, S250 turbo.
renopker is not online. Last active: 7/13/2014 7:44:09 AM renopker
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Re: Building my bobtach
Posted: 07/09/2012 01:56 PM
Back from powder coat
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