Crankshaft assembly jig

jsmx97
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jsmx97
Edited Date/Time 1/4/2021 9:25am
Does anyone know of a K+L or similar crankshaft assembly jig for sale? Used, new, it doesn't matter. I am referring to the jig that assemble the crankshaft halves when replacing the connecting rod.

Very interested and looking to buy...sick of paying other people to do what I know how to do.

If any of you guys know of any and could leave me a contact # or email that would be great.

Thanks!
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slipdog
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slipdog 1/13/2013 7:34pm
1/13/2013 7:34pm
jsmx97 wrote:
Does anyone know of a K+L or similar crankshaft assembly jig for sale? Used, new, it doesn't matter. I am referring to the jig that assemble...
Does anyone know of a K+L or similar crankshaft assembly jig for sale? Used, new, it doesn't matter. I am referring to the jig that assemble the crankshaft halves when replacing the connecting rod.

Very interested and looking to buy...sick of paying other people to do what I know how to do.

If any of you guys know of any and could leave me a contact # or email that would be great.

Thanks!
You should be able to get your local shop to order it for you from their K&L book. They're kind of pricey, but that's how I get a lot of my specialty tools.

The Shop

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BAMX
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BAMX 1/14/2013 9:49am
1/14/2013 9:49am
Do you really rebuild so many that you need a jig?
jsmx97
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jsmx97 1/15/2013 7:21am
1/15/2013 7:21am
@BAMX We had to send out over 30 cranks last year for rebuilding and replaced atleast 50... 30 cranks X $50/ea to rebuild equals $1500. Thats not even considering the rebuilding business we would have from rebuilding a crank we would normally replace. So in one year this tool would pay for itself.

I could do them without a jig but that is not the high quality way to rebuild a crankshaft, and is much more time consuming. This jig presses cranks together almost always perfect...no need for truing most of the time.

Actually called K+L and they have started producing again since I last spoke with them. Thanks for the help though guys!

-Josh
BAMX
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BAMX 1/15/2013 9:51am
1/15/2013 9:51am
jsmx97 wrote:
@BAMX We had to send out over 30 cranks last year for rebuilding and replaced atleast 50... 30 cranks X $50/ea to rebuild equals $1500. Thats...
@BAMX We had to send out over 30 cranks last year for rebuilding and replaced atleast 50... 30 cranks X $50/ea to rebuild equals $1500. Thats not even considering the rebuilding business we would have from rebuilding a crank we would normally replace. So in one year this tool would pay for itself.

I could do them without a jig but that is not the high quality way to rebuild a crankshaft, and is much more time consuming. This jig presses cranks together almost always perfect...no need for truing most of the time.

Actually called K+L and they have started producing again since I last spoke with them. Thanks for the help though guys!

-Josh
I see... I didn't know that this was part of your business not that there is anything wrong with buying tools for any reason Tongue
krgperformance
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krgperformance 1/29/2013 8:57am
1/29/2013 8:57am
hey jsmx97 i could make you one for 400.00 ill make it more fancy n what not this one is mine used crap out of it love it
newtyp
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newtyp 10/22/2013 11:27pm
10/22/2013 11:27pm
krgperformance

Granted this thread was early this year, but if your still able I am interested in purchasing a jig.

Please contact me.
krgperformance
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krgperformance 10/24/2013 8:28am
10/24/2013 8:28am






New fixture we made for customers comes with 7 sets of bushings
For different size cranks.
jsmx97
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jsmx97 10/25/2013 6:59am
10/25/2013 6:59am
krgperformance wrote:
[img]https://p.vitalmx.com/photos/forums/2013/10/24/34754/s1200_image.jpg[/img] [img]https://p.vitalmx.com/photos/forums/2013/10/24/34755/s1200_image.jpg[/img] [img]https://p.vitalmx.com/photos/forums/2013/10/24/34756/s1200_image.jpg[/img] New fixture we made for customers comes with 7 sets of bushings For different size cranks.






New fixture we made for customers comes with 7 sets of bushings
For different size cranks.
Still willing to make one for $400, if so im interested. What size press are you using? What type of runout are you seeing with your Jig?

Thanks man
newmann
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newmann 10/25/2013 7:23am
10/25/2013 7:23am
krgperformance wrote:
[img]https://p.vitalmx.com/photos/forums/2013/10/24/34754/s1200_image.jpg[/img] [img]https://p.vitalmx.com/photos/forums/2013/10/24/34755/s1200_image.jpg[/img] [img]https://p.vitalmx.com/photos/forums/2013/10/24/34756/s1200_image.jpg[/img] New fixture we made for customers comes with 7 sets of bushings For different size cranks.






New fixture we made for customers comes with 7 sets of bushings
For different size cranks.
I want one of those. Check your e-mail, the link on your site didn't want to go through.
krgperformance
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krgperformance 10/25/2013 7:43am
10/25/2013 7:43am
Hey we have made new and better fixtures so cost went up more time and lot
Better Material were used plus comes with 7 sets of bushings so there $850.00 now. Iv done lots lots cranks
Never had one run out over .0015 if any one would want one please email me or call the shop
Dirtbike_726@hotmail.com
5867950144
southwick_mx 10/9/2014 10:19am
10/9/2014 10:19am
Hi KRG!

Your tool looks very well made, and you inspired me to make my own. I didn't exactly steal/copy your design, but along same lines, I'm using 4 guide bars instead of 3, and made mine a bit larger in overall dimensions. I have a question for you, just out of laziness I figured I'd ask you about which sizes for the inserts you chose to supply with your tool? I have quite a few cranks to measure, but I'm sure you chose your 7 sized for good reasons!

I understand if you don't want to share, but I'd be happy if you find it OK! I promise a pic or two of the finished product when its done.

Cheers/

Lasse

Pit Row

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krgperformance
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krgperformance 10/9/2014 10:57am
10/9/2014 10:57am
@southwick_mx

thanks for compliment.
the crank fixture we sell are lot bigger then one we use when we rebuild cranks and we have done a lot of 450 cranks in the small one.

reason why we include the 7 sets of bushings its just conman size to fit different crank journals. because a lot of people cant make there own bushings we have so many one off bushings cuz we make them to fit the tightest on each crank 7 sets will get you quite a bit of cranks some might need sand .ID out to snug fit all depends the tighter the bushing is in the plates and on the crank the better the run out of the cranks will come out. we also will make any one off sets of bushings if they find one in the set that they think is to lose and once in a while it will happen
we are making a up dated fixture now ill post couple pics when done with brass bushing in top plate so it slides a lot better makes it more easy to use.


KRG
southwick_mx 10/9/2014 8:59pm
10/9/2014 8:59pm
Hi again!

So the anwer, in other words, is to make a bunch of "blanks" with an excellently snug fit in the plates' precision machined center hole, and have the IDs machined as different crankshafts come my way..!

Cheers/

Lasse
southwick_mx 12/8/2014 4:05pm
12/8/2014 4:05pm
Hi again!

My crank assembly jig is now finished. First test will be an -02 RM250 shaft pressed in a week or two or whenever the rod kit may turn up here...

I stole the basic layout, but it's not a 100% rip-off, right?

Cheers/

Lasse







krgperformance
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krgperformance 12/8/2014 4:24pm
12/8/2014 4:24pm
hey looks good.
how good dose it slid up and down ? the bushings a tight fit ? it looks really close to are fixture just with the 4th post never tryed it with 4 worked with 3 so we ran with it lol let me know how crank comes out
southwick_mx 12/9/2014 12:41am
12/9/2014 12:41am
Hi,

The upper part slides very easily and smoothly up and down, but it is really difficult to put it on the four guides if removed, because of the very tight fit. I'll be adding to my design a clamping feature to keep the upper plate i a locked "open" position to be able to load and unload the cranks witout having to hold it up. The thing is quite heavy, and could easily crush a hand if getting in between the plates...

I'm really excitet to see the results from this! Thanks for the inspiration, man!

/Lasse
yak651
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yak651 12/9/2014 5:38pm
12/9/2014 5:38pm
We use a lot of "die presses" at work, look similar to your jig. Look up "danley" they sell bushings that hold a tight fit and would allow it to easily slide up/down.
southwick_mx 2/26/2015 6:01am
2/26/2015 6:01am
First try out of the tool today. I had a left over RM250 2002 crankshaft to rebuild. Used a Pro-x conrod kit, and made special recessed bushings for this. Also made 3 solid 58mm pillars to control the assembled width of the unit.

Crank came out fine, and measured a runout between centres of 0.015mm, so a tiny adjustment by copper hammer is due to go under 0.01mm.

Overall I can conclude that my Chinese "20 tonne" (yeah, right!) shop press is a true piece of shit,, but the tool I made seems fine!

/Lasse



slipdog
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slipdog 2/26/2015 8:14am
2/26/2015 8:14am Edited Date/Time 2/26/2015 8:17am
DPR250R wrote:
Oh... so this... [img]http://www.chrome-addiction.com/prodimages/k-l-supply_3801-0152.jpg[/img]
Oh... so this...

FYI for anyone reading this thread, I got one of these dirt cheap from a shop going out of business. It was unused, still in the box so I figured it was a decent deal. Immediately, like I've since read on several forums, i noticed that the inserts seemed loose in the fixture as well as the inserts seemed to have a loose fit on the crankshafts as well.

So far not one crank has come out better than .004", what a POS, I can eyeball a crank with a straigh edge at .004" so why would I need a $1k jig for that???

Should have bought one from KRG...
krgperformance
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krgperformance 2/26/2015 8:19am
2/26/2015 8:19am
Yea I thought you see more run out on the centers. Lol I am not mad or anything thank you for thinking ours is well built .i don't blame anyone for making there own cuz we didn't have money to flip buy one too so we made are own. It's good fixture I think and pretty basic for a machinest to make. Did you make the post or use Thompson rod?
southwick_mx 2/26/2015 8:28am
2/26/2015 8:28am
I'm not familiar with the term Thompson rod? I used so called silver steel high precision 30mm axle shaft for the posts. So, no surface grinding or anything needed, just cut and go.

Trickiest partwas to precision bore the 4 holes for the posts and the center holes in one operation, since the holes were so deep, 70mm.
krgperformance
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krgperformance 2/26/2015 8:51am
2/26/2015 8:51am Edited Date/Time 2/26/2015 8:53am
It's just pree order type steel just kinda looked like it. We don't use it just was wondering yea we do the 3 post holes first then after post and every thing lined up we line bore center hole

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