[mcA896]

for my high school welding class, i m thinking of building aa hardtail mtb frame. i was curious as to whether there were some websites up that had any information about geometry/measurements, frame construction, and the like. any help would be appreciated as would any frame building pointers. also, does anybody know where i can order brake bosses, dropouts, bb shells etc.? i was thinking of getting some dropouts machined but i dunno if it would be cheaper to order some although i do have a machinist friend.

thanks.

 

[mcA896]

oh yea and dw, clean out your pm box

 

[HTFR]

check eastons site about tubeing. i did a search on google and got some info a while back. its not that helpful thought but worth the read. i beliv then said weld the seat tube first to the bb and the down tube to the head tube. but after that i donno.
my guess
1.seat tube to bb
2.down tube to head tube
3.top tube to head tube
4. TT DT and HT to BB and ST
5. chain stay to bb
6. steat stay from chain stay to seat tube.
7. then a whole lot of bending and aligning.

i was bored so i made that up i don't know if its true but thats the way i would do it
setting up the jigs will be the hardest part especially with a class period.

good luck with you one og a kind frame!

for drop outs use a drill press and a band saw to cat a basic drop out and if i remember correctly you may need cold roled steel (the good stuff)

 

[buildyourown]

http://www.geocities.com/smonfrey/

Has lots of links for beginner framebuilders. The best place to get drops is probably from henry james (link from page above)
You can order all the cable stops and BB from there as well.

If you want really burly SS drops you will probably have to cut them yourself. This is not hard to do with a hacksaw and some files.

For tubing, either order butted stuff from henry james or get cheap straight gauge cro-mo from aircraft spruce

http://www.aircraft-spruce.com/

or from wicks

http://www.wicksaircraft.com/

Both have good prices, service and selection but they carry different sizes.

You can email me with specific questions if you want
Good luck

 

[mcA896]

hey thanks for the pointers. i think i can do the jigs during class bec. i go to a voc. high where we do 2 weeks of shop then 2 weeks of academics. yea i was looking on easton for the bb shels, yokes, etc. i wonder...how can i order from them? i didnt see anything about it on the site

 

[HTFR]

i would not recommend useing alu. use cromo. 4130 is easyer to work with. less complicated heat treating and cooking involved.

 

[buildyourown]

I was assuming you were building a steel bike. Don't even try alum, especially for your first frame. Steel bikes are hard enough without having to deal with material that doesn't like to be welded and has to be heat treated. Alot of awesome hardtails are steel.

 

[buildyourown]

Originally posted by HTFR
check eastons site about tubeing. i did a search on google and got some info a while back. its not that helpful thought but worth the read. i beliv then said weld the seat tube first to the bb and the down tube to the head tube. but after that i donno.
my guess
1.seat tube to bb
2.down tube to head tube
3.top tube to head tube
4. TT DT and HT to BB and ST
5. chain stay to bb
6. steat stay from chain stay to seat tube.
7. then a whole lot of bending and aligning.

i was bored so i made that up i don't know if its true but thats the way i would do it
setting up the jigs will be the hardest part especially with a class period.

good luck with you one og a kind frame!

for drop outs use a drill press and a band saw to cat a basic drop out and if i remember correctly you may need cold roled steel (the good stuff)

Not to bash on you but that is just about the opposite of the preferred method. Lots of people have their orders but there is some consensus.

I have seen several good web pages from people who built their own bikes without jigs. I will try and dig them up.

 

[HTFR]

Originally posted by buildyourown
Not to bash on you but that is just about the opposite of the preferred method. Lots of people have their orders but there is some consensus.

I have seen several good web pages from people who built their own bikes without jigs. I will try and dig them up.

hahaha cool. i was totaly BS'ing that method. oh well can't win them all i supose some of that info would be greatly apprishiated. i'll try to find that info from easton too but i will have to wait until tomorow don't feellike opening a PDF file on my home computer it takes like 5 mins (oi) i'll try to memember to check tomorow

fun links:
http://www.eastonbike.com/downloadable_files/fab_instr/fab_instructions-7005_6061.pdf
www.eastonbike.com/downloadable_files/r&d_files/ R&D-03%20Scandium.pdf
http://www.eastonbike.com/downloadable_files/r&d_files/R&D-11 Tube Shapes.pdf