cortina seat mast...

[FyrFytrRyn]

so the new cortina i got has a busted seat mast, also, its the "short size"... i called cortina and talked to adrian and he cant really turn one out for a few weeks, so im just wondering, aside from making one myself, is there anyone here who knows where else i can get one, or if another off another bike works. the short makes the headtube to seat 17", the large makes it 22.5 or 22.0, also... on a side note, the dude i got it from lied to me, i got it home and pulled it apart to find that all of the alum. axles in the 4 bar support system were trash, broken through and moat all the harware has been rusted. luckily cortina has all this stuff laying around, so aside from the seat mast, all else will be easy to replace.

thanks for your comments in advance.

[Flat Broke]

Do you have an up-close pic of the damage? There are lots of capable fab/machine guys around that will work on anything from cars, to rails, to bikes or patio furniture as long as you're willing to pay their hourly rate.

Sucks to hear about the condition of the bike after you did an inspection, but on the bright side, it sounds like you caught it all before anything catastrophic happened. If the frame was neglected, I'd probably go over everything else with a fine tooth comb as well, just to make sure there aren't any more gremlins hiding in other components. Even if you have to spend some $$ to get things back up to snuff, the initial savings over what it would cost to build that rig (even buying all used off Ebay etc) will take a long time to overcome.

Chris

Originally Posted by FyrFytrRyn

so the new cortina i got has a busted seat mast, also, its the "short size"... i called cortina and talked to adrian and he cant really turn one out for a few weeks, so im just wondering, aside from making one myself, is there anyone here who knows where else i can get one, or if another off another bike works. the short makes the headtube to seat 17", the large makes it 22.5 or 22.0, also... on a side note, the dude i got it from lied to me, i got it home and pulled it apart to find that all of the alum. axles in the 4 bar support system were trash, broken through and moat all the harware has been rusted. luckily cortina has all this stuff laying around, so aside from the seat mast, all else will be easy to replace.

thanks for your comments in advance.

[FyrFytrRyn]

im currently in the process of inspecting the bike, have the entire rear apart and have had the swing arm sand blasted and its awaited to be welded up and gussetted. also, i got the seat mast repaired today and im gonna ride the short one until adrian can fire out the large size. all thats left is to get the swing arm heat treated and re-powdercoated and install all the new bearings and axels in the rear links and it will be FIN. bearings ship friday, ill have them monday.

***IMPORTANT: Does anyone in here know some one who does heat treating??, i need the 6061 T6 swing arm treated. all places ive talked to want a min 150.00 order.. they can fit up to 14 complete frames for 150.00 but all i need done is a lil swing arm, so that means i can either spend 150.00 on the swing arm, or find some one who can hook me up or throw my swing arm in with their batch and ill throw them some cash, like 30.00-40.00 hopefully. please let me know if you do... thanks!!***

[Flat Broke]

Email Spookydave. He might know someone who would do a smaller lot/part for a cheaper price. On the PC, shoot me the dimensions of the arm, and I might be able to do that for you on the cheap(as long as I have a color of powder that you can live with on hand).

Good to hear you've got it all sorted out.

Chris

[FyrFytrRyn]

thanks chris, ill PM him.. also, im getting the arm blasted and re-coated black for 60.00 all together, seemed reasonable but i dont know how much it normally costs. if i find u can do it cheaper, ill send it to you. est. how much for it, off the top of your head?

[Flat Broke]

Originally Posted by FyrFytrRyn

thanks chris, ill PM him.. also, i got the arm blasted and re-coated black for 60.00, seemed reasonable but i dont know how much it mormally costs. if i find u can do it cheaper, ill send it so you. est. how much for it, off the top of your head?

If you got it blasted and coated for $60. thats not bad. I'd spray it for nothin, but prefer to only do stuff that has already been stripped. The two catches are the size of my oven is small(hence the reason I asked the dimensions) and that by the time you drive it out from Yucaipa, then pick it up, factor in gas for both trips, you might as well have someone close to home do it for the $60. I'm a little unclear about the heat treating though. You're having that done after the powder has already been sprayed? If I recall correctly, you heat treat 6061 up around 950*F which is past the survivability for standard polyester powders. In other words, if the guy cutting you the deal on the PC will strip and shoot for $60 that's cool. Just make sure he's cool with stripping the part, you taking it for heat treat, then bringing it back for PC.

Chris

[spookydave]

The swing arm was cracked too?? Man, at this point I'd almost be ready to sock somebody. Still an ok deal for the parts but is all the hassle worth it.....

Anyway it's going to be awhile before I send anything out. And to tell the truth I size my production runs around the min lots sizes at heat treaters and the anodizer.

Lets see a photo of what is going on with the swing arm. I've got a great alum welder right across the street. He's not cheep but won't junk parts.

I've also known more then a few to weld up swing arms / frames and not heat treat it. I know I know, I'm not saying to do it but just that I see it done.

One thing to ask or look into is will the swing arm pull or move during heat treat? I bet most go back on the jig for a tweek here and there after heat treat.

[Flat Broke]

Dave,

Couldn't he just weld up a crude fixture to bolt the swing arm to during heat treat? Something simple that catches at the pivot and at the axle mounting point? I hadn't even thought about the deal coming out of true or springing on him at those temps. Thats why you da man For that matter, if it's cracked and needs to be welded, woulnd't it be best to have it in a fixture at that point as well?

On another note, I've got a job I need a price on. Check you'r pm's in a minute or two. Off to feed the kiddo.

Chris

[FyrFytrRyn]

yeah the effing swing arms was cracked to, the dude i bought it from dropped the price accordingly (tried calling him about this mess, refuses to answer his phone). but i was super pissed about the seat mast and all the destroyed bearings, the guy obviously didnt care much. chris, hes a friend of mine does PC and blasting/polishing, he blasted it, i took it in last night to get repairedby another friend (offroad fabricator), and after i get it treated hes gonna PC it. he just told me before hand how much it was gonna cost... so dave, i dont mind waiting for it to get treated as long as its cheaper. also, this hassle isnt a big deal, its not my #1 bike, so i can still ride, little project, kinda fun. although i wanted to be on it by now, im just dissapointed i was lied to. so is a jig def. necessary? also, as far as i know 6061 T6 losed approx HALF its strength after welding. ive also heard of it done w/o treating and have heard decent results, but id like the piece of mind.

[spookydave]

You wouldn't save any money putting it in a batch with me. Well I guess you would but I would loose big time. I can put about 5k worth of parts in the space your swing arm would take.

I do feel your pain on the min charge. I want to take a few parts to the anodizer all the time. Black anno too, you know they do that color every day. But nope, never will toss it in with something else. Well they prolly do but still dink ya for the min.

[dirttorpeedo]

ryan,have you ased cortine if they cuold repiar the bike?they've got the corect jigs and the welder,just a thot.

[FyrFytrRyn]

yeah, but since its out of warranty its gonna cost a f*&#*!# leg to do it i passed on cortina, so since either way im screwed right now, might as well have a friend do it(hes a professional offroad fabricator, so no worries) for cheap as compared to cortina (cortina offers no warranty after they repair too). all i have to do is get it treated. looks like ill have to just spend the 150.00 since i havnt gotten anywhere with looking for a cheaper price.

i guess now the real questions is, do i absolutely have to heat treat it. like was said before, people have built snit and not treated it, and nothing bad happened. and since im adding mucho support to it (since it had none in the area before) i figured it might just make it equal, then again, i am one to have shi# luck, so i think i better just get it treated or i would have spent 60.00 on the repair, 65.00 on the blasting and PC and 90.00 on the bushings just to have to pull the bastard apart AGAIN and re-do the whole process + the 150.00 for the treating just because i was reluctant to do it right in the first place.

[spookydave]

sounds like you answered your own question to me.

[FyrFytrRyn]

heres a shot of the repair work. the lil triangle 1D (4 of them) and the 3D (2 of them) gussets were added. the 1D ones were simply cut out of 6061 T6 and welded on, the 3D ones were cut out, shaped in a brake, then welded on. taking it to newton heat treating early next week.

[dirttorpeedo]

good idea,since it seems to be alot of welding the h/t wont hert,then the hunk of meaness will be ready for the next d/h.good luck!

[FyrFytrRyn]

dropped the swing arm off and seat mast today @ newton heat treating. would be done late this week early next week, hope to have it ready by next weekend, depending on when i recieve the bearings.. what color should i PC the swing arm? bright pink?

[roadkillross]

nice dude this sounds like its gonna be a dope bike cant wait to see u shredding on it

[dirttorpeedo]

what about alingment,swingarm more than seat mast.bearings you cood get at a bearing house,they are nothing speacial.

[FyrFytrRyn]

what do you mean by alignment? i put a piece of threaded rod through the drop outs with nuts and washers on each side od each drop out spaced to adrian cortina's specs.. he and the heat treater (newton heat treating) both said thats ample, newton does ALOT of MTB componenets and aluminum, and does no other jig'in aside from that, if thats what you mean by alignment. i needed not only the bearings, but the aluminum axles and all the spacers and .12 shims and orings used in the rear link, so instead of running all over in my ranger that gets crap for gas milage, i just ordered them from cortina to save me time and headaches. also, the seat mast is temp i think. its the "short" size, so i just had my buddy blast a weld on it, and threw it in with the swing arm to get treated because it was going to be 150.00 either way. im pretty sure a week or so after i get it rollin ill go pick up some stainless and have my buddy make a new mast thats larger.

[roadkillross]

make sure post pics once its done