Making GT Power Series out of Primo Powerbites  RSS Feed

#1 2012-03-29 7:32pm

Boersck
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Making GT Power Series out of Primo Powerbites

I am going to do my best to make a copy of GT Power Series 3 piece cranks.

I bought a set here on the museum for $55. Here is some pics with what I started with.
http://i1187.photobucket.com/albums/z396/Boersck/Primooriginal.jpg
http://i1187.photobucket.com/albums/z396/Boersck/Primountouched.jpg


I tig welded the Logo. I preheated the arms to 400 degrees. Then tig welded. Post heated at 400 degrees to stress relieve.The brown color is the coating burning off. There was no coating by the logo.Very easy to do.
http://i1187.photobucket.com/albums/z396/Boersck/securedownload.jpg
http://i1187.photobucket.com/albums/z396/Boersck/Primo.jpg

Last edited by Boersck (2012-03-29 7:33pm)

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#2 2012-04-03 8:33pm

LooseNut
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Re: Making GT Power Series out of Primo Powerbites

smile




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#3 2012-04-03 9:07pm

xtremevert
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Re: Making GT Power Series out of Primo Powerbites

I did the same thing.  it works great.  smile

here's the link to see how mine turned out.

http://bmxmuseum.com/forums/viewtopic.php?id=100461


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#4 2012-04-05 2:58pm

Boersck
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Re: Making GT Power Series out of Primo Powerbites

Next I ground the weld smooth,  Then media blasted them, followed by a few hours in a deburring tumbler. This was the results.
http://i1187.photobucket.com/albums/z396/Boersck/0402121426.jpg

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#5 2012-04-05 3:01pm

Dirty Habits
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Re: Making GT Power Series out of Primo Powerbites

Nice, Now The Decals! big_smile


[img]http://i1005.photobucket.com/albums/af178/DirtyHabits1974/BMXbikes-2-1-2_zpse15e00ac.jpg[/img]

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#6 2012-04-05 3:08pm

Boersck
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Re: Making GT Power Series out of Primo Powerbites

I have noticed as I looked at other Primo cranks people have done that the outside profile looked wrong. I am a Model Maker by trade, so I went ahead and measured these. In the picture below the red line represnts the outside shape of the Primo's. The white line is original GT Power Series cranks. They are slightly different.
http://i1187.photobucket.com/albums/z396/Boersck/0404121352.jpg

Another print out in black and white. I will be using this geometry to cut right to the line in a CNC Machine.The profile will be exact.
http://i1187.photobucket.com/albums/z396/Boersck/PowerSeriesprofile.jpg

Last edited by Boersck (2012-04-05 3:27pm)

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#7 2012-04-05 3:13pm

Boersck
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Re: Making GT Power Series out of Primo Powerbites

So what could I do to make these look exactly the same As Power Series? I would have to cut the outside. But first I would have to add a little material by the square, before I cut it. I want these to look as close to originals as possible.
http://i1187.photobucket.com/albums/z396/Boersck/0404121418.jpg

Blasted weld. Check them out. The weld is way more than what I need. I will cut most of it off.
http://i1187.photobucket.com/albums/z396/Boersck/0404121151a.jpg
http://i1187.photobucket.com/albums/z396/Boersck/0404121151.jpg

Last edited by Boersck (2012-04-05 3:28pm)

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#8 2012-04-05 3:19pm

LooseNut
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Re: Making GT Power Series out of Primo Powerbites

Now we're talking! cool




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#9 2012-04-05 6:31pm

BmxRacer4
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Re: Making GT Power Series out of Primo Powerbites

DAMMM Those Look So Nice big_smile

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#10 2012-04-05 9:35pm

xtremevert
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Re: Making GT Power Series out of Primo Powerbites

should of left them man.  no one would ever notice the 1mm difference.  how are you going to get them perfect?  are you going to do some machining or just sand them to look how you want them?


My Father once spoke to me and said "The way you look at your bike is the way I see My children, I look past the imperfections and rough surfaces to the beauty of the finished product."

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#11 2012-04-05 9:54pm

LegoMyDayGlo
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Re: Making GT Power Series out of Primo Powerbites

Wow!! You diiiid that!   Awesome!  Xtreme has point too man, I think you was really close already smile  see what happens , looks like you have some skills!


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#12 2012-04-05 10:40pm

Boersck
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Re: Making GT Power Series out of Primo Powerbites

You guys have to have some faith, I 3d machine every day for a living. I am making a fixture to hold these, then they are going into a cnc machine to get cut.

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#13 2012-04-05 11:04pm

LegoMyDayGlo
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Re: Making GT Power Series out of Primo Powerbites

damn, sounds like you do have this under control.  Can't wait to see how you finish them


THE GREAT DAYGLOW CRUSADE 3/30/2012 - 5/2/2012.  MAY THERE BE PEACE AND DAYGLOWS FOR ALL ONE DAY AROUND THE WORLD.
First rule of the OG Dayglow owners club, we don't talk about the OG dayglows.  wink 
EF PROFORMER #18 big_smile Stay RAD!
RIP Brice Minor "lil billy" cuz.  7/18/12 sad
2014 SPRING DYNO BUILD OFF - Entry Submission Thread > http://bmxmuseum.com/forums/viewtopic.php?id=567890
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#14 2012-04-06 6:37am

Gustafa
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Re: Making GT Power Series out of Primo Powerbites

This is pretty dope! I have a job for you if interested! Not bmx related, but pretty dope.

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#15 2012-04-07 6:55am

getmoney
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Re: Making GT Power Series out of Primo Powerbites

Looking forward to seeing this completed, should be awesome I'm sure. Will you be removing the extra aluminium from the backs of the arms I guess on the non-drive arm too make it as close to the GT non-drive arm?


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#16 2012-04-07 7:49am

JOHNNY P
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Re: Making GT Power Series out of Primo Powerbites

This site has some extremely gifted people.cool


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#17 2012-04-07 11:15am

Boersck
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Re: Making GT Power Series out of Primo Powerbites

The plan I have on these is to machine the profile, then use the fixture to machine the backs to replicate power series.

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#18 2012-04-07 10:17pm

kbillan
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Re: Making GT Power Series out of Primo Powerbites

Impressive, Boersck.

I have a bench top CNC mill I play with. do you have a shop? work at a shop?

Open to commissions? screw it.. PM..


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#19 2012-04-08 8:20am

astroidbeltwalker
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Re: Making GT Power Series out of Primo Powerbites

to get the weight down (not strenght) could you drill an cap the cranks. drill some holes, instead of refilling with a light
material just cap the holes top & bottom with weld or another material.


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#20 2012-04-10 1:47pm

Boersck
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Re: Making GT Power Series out of Primo Powerbites

I am in the process of getting quotes for a 3D scanned image of the outside shape of Power Series arms. Once I get that it will be easy to machine these into exact replicas.

The fixture is almost done.

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#21 2012-04-10 1:55pm

Gustafa
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Re: Making GT Power Series out of Primo Powerbites

Boersck wrote:

I am in the process of getting quotes for a 3D scanned image of the outside shape of Power Series arms. Once I get that it will be easy to machine these into exact replicas.

The fixture is almost done.

Or make some crank replicas from a block? hmmmm? LOL

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#22 2012-04-10 2:16pm

Boersck
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Re: Making GT Power Series out of Primo Powerbites

With a model anything is possible, I want to see how the conversion works first. It would be nice to be able to use primo's bottom bracket with arms that looked exactly like Power Series.

I know the spindle bolt is different too, I have plans for that also.

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#23 2012-04-10 4:46pm

Boersck
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Re: Making GT Power Series out of Primo Powerbites

Got my first quote for a 3D Model. $700. I think I may need to look around more:(

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#24 2012-04-10 5:09pm

astroidbeltwalker
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Re: Making GT Power Series out of Primo Powerbites

whats a 3d model


they live, we sleep
Wtb pro class frame or F/f
Wtb bullseye 1st gen crank 175,177,180

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#25 2012-04-10 6:30pm

wired
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Re: Making GT Power Series out of Primo Powerbites

I think you already went above and beyond with your weld as they really look awesome.


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