Framebuildin'

[rancid_burple]

Loaded chainstays and dropouts in my rear end mitering fixture. Dropout plugs needed some filing, goes quick with aluminum! Set it up and mitered the chainstays. CS might end up a couple mm shorter than the 410mm I had on my drawing due to some triangulation error when I rough cut them to length.

Mitered the ST scallop on the DT and checked fit before I took it out of the mill… “get it right, get it tight”. A bevel protractor with a piece of 7/8” bar chucked in a collet is how I’ve been setting angles. Works well enough I’m not going mess with rotary tables or tilting vises on the new machine I think.

Wedged the BB against the DT on the granite table to mark the length for the HT end cut and check that the miters are in phase. I used to fuck with centrelines and shit but I like to just check things as I go along like this. I’m sure it’s influenced by my work experience. I like indicators, micrometers and calibrated surfaces more than an effbuilder probably should.

[Master_Stabby]

Aren’t you supposed to just slap it together and then cold set it so it’s sort of straight?

[rancid_burple]

Doesn’t matter how precise you set it up, once you spark the torch (tig or oxy/fuel) it all goes out the window… so yeah pretty much lol.

[rancid_burple]

Going real smooth. Everything checks out!

Next is take it apart again, drill vent holes in the BB and headtube and start cleaning the tube ends inside and out. Then tack the main triangle, fixture in my rear end jig, miter and set up the seatstays and then wait for two consecutive days with no commitments to weld everything and throw it in the oven I built.

[rancid_burple]

Vented, slotted and some testing of the aging oven.

[asterisk]

What are you using as a quench tank?

[rancid_burple]

No quench needed for 7005, just aging. 6hrs at 200f, 4hrs at 320f.

Or put it in a hot attic or furnace room for a few months.

[halbritt]

I am very stoked about these developments @rancid_burple

[rancid_burple]

Thanks! The aluminum thing has been a long time coming. I have a lot more material, bought a pile of tubes from a former guru employee last year.

[karl_dandleton]

just needs aging after welding right?

does 6065 need a quench?

[rancid_burple]

Probably?

6061 is solution, quench and age. I assume other 6XXX alloys are similar.

Solution temp is just below melting.

[LASER_BEIGE]

Any of u FBs know where To get those cool dedacciai seat stays?

[turpentine]

Ceeway carries dedaccai and ships to the us.

[rancid_burple]

Bike fab supply distributes the full dedacciai line in the US.

Front triangle is tacked and the seatstays are mitered.

Struggled a bit with welder settings but got things sorted after a bit of testing on some aluminum flat stock. Then I forgot to clean the inside of the seattube resulting in some really gross tacks at the TT joint . Should be fine once I fully weld everything next weekend.

[Gary_the_tennis_ball]

Do any Eff-Bees want to peep this and make sure nothing stands out as terribly egregious?

Changes from the base bike and reasoning can be found here:

Weird Build Dithering Thread Infinity: Part 2

RE: BMC Build. I guess the carbon aero handlebars with likely not very aero riding position stuck out to me, along with the fact if I recall those rims are pretty heavy, plus a pretty heavy saddle. Its fine. In other news, talk me out of having the Sequoia I crashed into retirement made in Chitanium. I goofed around in solidworks the last couple of days and fixed some things I didn’t like about it originally. I steepened the STA by .5*, Raised the stack a smidge to eliminate some spacers/get t…

[EndpointBraden]

Looks like a cross bike.

[rancid_burple]

Unless you’re gonna be shredding serious gnar on it I’d lower the BB to 70-75mm drop.

If it was me I’d also steepen the HTA a half a degree. The trail is a bit high for my tastes as is.

[drwelby]

@rancid_burple

…Bike fab supply distributes the full dedacciai line in the US.Front triangle is tacked and the seatstays are mitered.Struggled a bit with welder settings but got things sorted after a bit of testing on some aluminum flat stock. Then I forgot to clean the inside of the seattube resulting in some really gross tacks at the TT joint . Should be fine once I fully weld everything next weekend.

So stoked to see you tread into these waters - I’d really like to be able to build AL frames one I finally get set up with a TIG.

[drwelby]

@Gary_the_tennis_ball

Do any Eff-Bees want to peep this and make sure nothing stands out as terribly egregious?

Changes from the base bike and reasoning can be found here:

What’s the mission statement for this bike? Why steeper STA?

[Gary_the_tennis_ball]

@rancid_burple interesting, those are a couple of things I didn’t change from the geometry as it came from specialized.

@drwelby replace the bike I crashed and experiment, try to change a couple of things I wasn’t crazy about. As for seat tube angle, i wanted it to be steeper almost as soon as I got on the sequoia, so I made it a little steeper on this.

Edit: interestingly enough the 2017 model had a 74* STA compared to my 2018s 73.5*