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| Truck Reviews (15215 Posts)
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Miso Honee
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On 6/10/2005
Chris Chaput
wrote in from
United States
(66.116.nnn.nnn)
I'll call this baseplate the Rhino, because it two horns coming out from it. One is the kingpin and the other is the queenpin, down by the removeable pivot cup. Use a 3/8" locknut to fasten the keyed pivot cup assembly securely to baseplate. It would probably be cheaper to manufacture this than the current baseplate/stainless-insert/kingpin/pivot cup.
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Chaput's Courtroom Scenario
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On 6/10/2005 Paul Howard
wrote in from
United States
(67.171.nnn.nnn)
Nice, humorous, entertaining work. Worth the reading. -Paul
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done that
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On 6/10/2005 herbn
wrote in from
United States
(64.12.nnn.nnn)
actually the bearing in my baseplates are held down with a couple little bolts that thread into the base and the bolts head overlaps with the outer bearing race. I have a delrin washer that handles sudden thrust loads(like running into a seam),the washer is notched for the bolt heads and the hanger surface slides on the washer. I saw,in your drawing, a split cap to remove the hanger without removing the kingpin,and i saw a lot of work,not to mention that the bolts holding a split cap down would have to be on either side of the bearing,which conflicts with the bolts that mount the baseplate to the board. If you had bearings made with flanges that rest against the half round bearing seat,,,man i think that's some serious money too,,if you had rodend bearings made with no threads on the stud,you could clamp that in the base.....
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Ch Ch Ch Changes
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On 6/10/2005
David Bowie
wrote in from
United States
(66.116.nnn.nnn)
...I’m much too fast to take that test...
Ch-ch-ch-ch-changes
(turn and face the strain)
Ch-ch-changes
Don’t want to be a richer man
Ch-ch-ch-ch-changes
(turn and face the strain)
Ch-ch-changes
Just gonna have to be a different man
Time may change me
But I can’t trace time...
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?
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On 6/10/2005
-X-
wrote in from
United States
(151.200.nnn.nnn)
I think they had a wicked massive slalom scene in Florida between 1985 and 2002.
But I'm just a junkman like Fred Sanford. What do I know? Also, I anly raced from 1976 to 79, then 2002 to now.
And not very well, I'd add.
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27 years of Racing
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On 6/10/2005 ?
wrote in from
United States
(66.116.nnn.nnn)
"I have raced 27 years wondering how to get around this fact."
Where have you been racing all these years?
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Rad kingpin orders
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On 6/10/2005 Chris B
wrote in from
United States
(204.78.nnn.nnn)
Hey G, You can buy Rad Kingpins thru Radikal, i believe their about 25.00 a pop.
They're not on the website though
Call 1-877-RAD-SK8R
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Keep It Simple
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On 6/10/2005
Chris Chaput
wrote in from
United States
(66.116.nnn.nnn)
Herbn, I think that you're making the pivot cap design concept too complicated. You could easily design it so that the entire pivot cup (with the pivot bearing inside it) is fastened to the baseplate with one bolt. You'd simply key the baseplate and the pivot cup so that once the pivot cup is slid down onto the baseplate (along with the hanger), a single nut or bolt would secure it in place.
My first image of the concept split the pivot cup into two sections, but that was just to show how the hanger and bearing could be disassembled instead of having to thread and pull the kingpin. If you start a baseplate design with the idea of a removeable pivot cup, a lot of elegant solutions will avail themselves.
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pivot cap
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On 6/10/2005 herbn
wrote in from
United States
(64.12.nnn.nnn)
you could make an optional extended pivot cap with a bracket that reaches over to the kingpin and snugly slides over a smooth tip on the end of the kingpin. Are the kingpins breaking at the base of the threads?,there could be a few less threads on that bolt,you should never have to tighten down(preload a bushing) more than a couple of turns. Tightening down on a bushing reduces travel and increases that endstop effect that stresses kingpins,and other parts too. A pivot cap , the way cc drew it is not really so simple, it would need two bolts,on either side to clamp,bolt holes need to be drilled,and tapped and in the cap part a clearence hole and probabely a counter bore for the bolthead to sit in,you need the bolts and the assembly time increases.The holes in the cap and the base need to be finnished,and in the case of painting masked off. As opposed to drill/reaming an accurate hole for the spherical bearing and plugging a round hole when painting. Hey, i just got comparible idea,make a split base, right and leftside. The truck design symposium lives on the internet.
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Radikal Kingpins
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On 6/10/2005
G
wrote in from
United States
(64.207.nnn.nnn)
Where can you buy replacement kingpins and how much are they? I tried looking on the Radikal website but could not find them. Hopefully they are cheaper to replace than the axles.-G
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Pandoras box
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On 6/9/2005
Tod
wrote in from
United States
(12.148.nnn.nnn)
I hate to even say this 8-).... but, the way the Seismic kingpin is designed, i.e.(the threads tension a shoulder on the pivot stud INTO the baseplate, distributing the sideloads over more surface area... this would let the current Radikal way of changing bushings work... and would provide more support for the spherical bearing hanger design Radikal employs...
BTW, I love my RADIKAL and would love to see it's geometry in a cast,(read CHEAP), cone your wheels on the bike path, everydays a freeride type of truck....
Still truck related....
anyone into rendering the traditional four hole baseplate mounting scheme obsolete? at least in our little racing world...
Being able to pull a truck off with the ease of say, disengaging a ski boot from a ski binding or a cycling shoe from a racing pedal would be a huge time saver at any race, or practice session for that matter....
Yeah....I'm lazy...and I'll spend lots of $$ to stay that way....
Thanks for listening, Tod
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Why not?
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On 6/9/2005
Chris Chaput
wrote in from
United States
(66.116.nnn.nnn)
I still think that the "pivot cap" is a good solution. Here's why:
A couple of things happen when you use a kingpin that's inserted through the bottom of the baseplate:
1. You know it's going to be as strong as any other truck that uses the same method
2. The kingpin is still replaceable
3. You won't need that 9/32" wrench to tighten or loosen or hold the kingpin
4. You won't have that 9/32" nipple at the end of the kingpin that stops a skatekey from fitting onto the 9/16" locknut
5. You won't have to worry about the kingpin being loosened when the locknut is being loosened
6. You don't have to hold/remove the bottom cushion to change just the top cushion
7. A grade-8 bolt from the hardware store will work jsut fine
Although making a pivot cap for the pivot hole requires an additional baseplate part, you won't need a threaded insert for the kingpin, so it's somewhat of a wash. Although you'll need to fasten the cap to the plate, you can use a 3/8" hex headed fastener that your skatekey already has. There's plenty of room in that area to add this feature.
This will also make the pivot bearing easier to replace than the current press-fit one.
Outside of a few tweaks to the baseplate, this is potentially a low cost long term solution.
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Another Tree, More Barking
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On 6/9/2005
Chris Chaput
wrote in from
United States
(66.116.nnn.nnn)
Just exactly how is that thing going to slide through the cushions and spherical bearing when assembling the truck?
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Note the tasty radius
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On 6/9/2005
-X-
wrote in from
United States
(151.200.nnn.nnn)
That's it.
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How about this
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On 6/9/2005 Bill
wrote in from
United States
(207.114.nnn.nnn)
This is photo of Auto-racing rocker arm stud, 3/8" diameter. Would something like this work?
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Kingpin Krisis
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On 6/9/2005
Bill Boothby
wrote in from
United States
(66.214.nnn.nnn)
Add my name to the list. This time a Radikal rear...black bushings top and bottom adjusted to a thread and a half showing. 225lbs of fun bookin' down the hill, all of a sudden the tail goes haywire. The hanger stayed hooked to the baseplate via the pivot,I somehow rode it out.The kingpin snapped at the first thread. Both front and rear were rushed back for upgrade two weeks ago.Bummed everyday the UPS truck doesn't stop...I'm whining, aren't I ?
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that old?
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On 6/9/2005 chris B
wrote in from
United States
(204.78.nnn.nnn)
get outta dodge!....(that's me calling you right now)
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kingpin
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On 6/9/2005
Miss Kitty
wrote in from
United States
(65.40.nnn.nnn)
Just wanted to add that I spoke with Sparky this morning--he got the truck in question back, and couldn't believe what he saw! The truck in question is a 1st generation set of trucks--it had NO stainless steel insert in the baseplate WHATSOEVER. For all intents and purposes, he was looking at a first run prototype antique. We are replacing this with a brand new truck.
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skinless
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On 6/9/2005 ChrisB
wrote in from
United States
(204.78.nnn.nnn)
Hey, if you think that rash is ugly, you should see my skating style....
now THAT's ugly
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Address the issue, Mark
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On 6/9/2005
Geezer-X
wrote in from
United States
(151.200.nnn.nnn)
http://img.photobucket.com/albums/v228/KCRChrisB/w%20stuff%20w/000_0031.jpg
Big road rash and a dislocated elbow doesn't constitute a serious injury?
You can say anything you want about me Mark. I encourage it.
The fact remains, and it is one supported by physics and common engineering practice:
Your kingpin design is wrong. There is a threaded area at the point of greatest side load, which will cause a crack to propogate through the part.
A piece of 3/8" steel hardened to grade 8 has a tensile strength of about 16,600 pounds and a shear strength about 60% of that. A 230# man making his best effort with a hanger and wheels as a lever should not be able to break it.
I said absolutely nothing which was a personal indictment of your product or character other than that your attitude regarding the issue seems a bit casual, and that the kingpin has an obvious design flaw.
The fact that the best you can offer is simple slander is disappointing.
Address the issue.
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Barking up the wrong tree
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On 6/8/2005
Chris Chaput
wrote in from
United States
(66.116.nnn.nnn)
C'mon guys. Which cushions are being used has absolutely nothing to do with why the kingpings are breaking.
I can't believe that you're ignoring all of the materials and structural differences with the baseplates and kingpins and spherical bearings and are looking at the size or shape of the cushions as the problem.
If cushions were the only problem, then anytime we put large cushions into Trackers, Randals and Indys, their kingpins would just start snapping? I don't think so.
Guys are going put whatever kind of cushions they want into a truck and the majority of skaters are NOT going to retire their kingpins in a timely fashion. If these simple facts aren't addressed in the design of the truck, it's a design flaw in my book.
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heated
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On 6/8/2005 herbn
wrote in from
United States
(152.163.nnn.nnn)
i looked back, i did not realize this page got so heated. I agree, somewhat, with mccree, geezer, you gotta stop posting that lazer thing,that truck mod is nowhere near structurally sound. Havn't done any calculations, but just looking at the casting thickness around that axle,ugh. Why Radikals might break kingpins more than other trucks?,,, i looked back and saw some pics,they're run with loose quick turning bushings,radikal owners seem to prefer mostly square,unconed bushings,these sort of pack up,kind of loose and then build up quickly(like an end stop),i'd bet front kingpins break more. Radikal owners use a flat not much turning geometry truck, as a back truck, so the front does all the steering and needs to liened more,steep geometrys tend to twist kingpins a bit more. The way a radikal hanger hugs the shape of the bushing,does it touch when steering? it looks like it might,therefore pushing on the bushing. This ads to the endstop characteristic of the square bushing,essentially you have a slalom guy (usually overweight:)bouncing the hanger off the endstops around each and every cone,and you wonder why the bolt breaks.
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some where
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On 6/8/2005 herbn
wrote in from
United States
(152.163.nnn.nnn)
in the homemade boards section ,is a pic of my latest trucks.Hollow aluminum kingpin and all,it is Really light,and i don't think it will ever break. I made a 7075 billet bracket that bolts onto the pivot area of the baseplat with one small bolt but it does interlock with the baseplate (all parts 7075 t6) the kingpin threads into this bracket and is clamped in the baseplate,it's supported on both ends(so it's not a cantelever?),my hanger pivots on a stack of two minibearings and the pivot pin is a little stub of 8mm cromoly with a bolt through the middle, so it it holds weight, my trucks can be ridden without kingpins,so a broken kingpin would only result in a (very) loose ride.Now producing this stuff at afordable prices,, different story,mccree could afford a personal set.
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Kingys
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On 6/8/2005 Richy C
wrote in from
United States
(207.200.nnn.nnn)
I weigh about 230lbs and push them Radikals in all types of racing! I have not encountered any probs! They are amazingly responsive and stable for me! Oi!
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Type Ohs
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On 6/8/2005
Chris Chaput
wrote in from
United States
(66.116.nnn.nnn)
I think that my last post had more typos than my previous ten. I'm going to bed.
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