[sikocycles]

Not sure if this is the right place but it is shop talk.
Always wanted to build a frame so after a real shitty 2020 I promised myself 2021 I will build a frame or 2.
So I am building a 8020 jig while I practice tig welding. Hope to have it complete sometime in February.

 

[jonKranked]

very cool.

 

[Westy]

Nice. I keep an eye out for 8020 my company surpluses.

 

[sikocycles]

 

[sikocycles]

A little progress. Finished the slot for the bolt to adjust head tube angle and added a pointer that will reference the degrees that will be machined and laser etched in the back plate.

 

[englertracing]

what will you be building after you finish the jig?

 

[sikocycles]

E bike recumbent. J/k
A hard tail trail bike.

 

[englertracing]

E bike recumbent. J/k
A hard tail trail bike.

steel or aluminum?

 

[sikocycles]

Steel for a while then I hope to try Ti

 

[sikocycles]

Degree numbers are on.

 

[mtg]

This is cool. Tips from designing and making multiple iterations of frame weld fixtures: make it stout, give more weld access than you think you need.

 

[sikocycles]

It will be stout.
160x80 spine. 80x80 upright
1” thick jig plate for the headtube, BB and axle plates. Will pivot at the BB center to X0 and Y0 never changes. Will have built in purge.
Will have the BB,Headtube and axle 4” on center.
Should be more? Or 4” enough?

 

[buckoW]

This is cool. Tips from designing and making multiple iterations of frame weld fixtures: make it stout, give more weld access than you think you need.

What do you think of the Cobra design? I stopped my original direction and got some 8020 recently. I think that one looks pretty nice?

 

[mtg]

What do you think of the Cobra design? I stopped my original direction and got some 8020 recently. I think that one looks pretty nice?

Just looked it up, the thought process makes sense, but having done something similar in the past on my first frame fixture, I found that using indexed dimensions that actually are the frame geo dimensions saves a ton of time. The Cobra design looks like a giant pain to get the BB in the correct position.

 

[sikocycles]

Cobra’s frame jig looks great and thought about it but was out of my price range so I’m making mine.
I rather see the frame geo in the jig so I know what it will look like lore or less. Mine is a copy of 44 bikes with some mods.

 

[sikocycles]

So head tube is finished except for the stand offs. Waiting on a head tube before making and deciding on how much stand off.

 

[sikocycles]

Small progress today. Been working on BB area

 

[dump]

Are you doing the machining yourself?

 

[sikocycles]

Kind of with the guidance of a machinist at work. He is helping me with a lot of the set up and lay out. Trying to learn.

 

[sikocycles]

Progress getting BB area worked out needs to work with T47 and BSA

 

[sikocycles]

Now with degrees

 

[sikocycles]

Fitted it last night and perfect. Just need to laser the degree numbers and logo.
rear end next week along with stand offs.I have a headtube and BBs coming in. It’s getting heavy I will weld up a stand for it

 

[buckoW]

Beauty! That’s turning out so good! I’ve been making one lately too but yours is looking so good that I’m embarrassed to show mine, haha.

 

[sikocycles]

Show it. We don’t judge. It’s all good.
I did over do mine a little bit but been wanting do make one for years so there has been a lot of obsessing going on.

 

[buckoW]

Show it. We don’t judge. It’s all good.
I did over do mine a little bit but been wanting do make one for years so there has been a lot of obsessing going on.

I‘m just playing around. I’m fine if you judge me!
I think Oscar from Simple’s jig looks to be real nice!
I got a manual mill recently (in trade for moto parts) so I want to try and make some parts like your jig.
My goal is to modify my seat angle on my DH frame to be steeper for a dropper post so I was making a jig just for this application. It’s evolving slowly and I’m planning on getting stuck into it after I build another snowboard or two.

 

[sikocycles]

As long as it does the job it is good.

 

[boostindoubles]

Oscar has owned Arctos for years now and has spent alot of time refining the jigs so he can sell them. They're pretty nice but also cost real money.

 

[sikocycles]

Yes, that is why I am building mine. I dont have 3-4K to drop on a jig for a hobby

 

[sikocycles]

A lot done. It weighs a ton. Need a serous stand.

 

[sikocycles]

Hope to finish it next week

 

[sikocycles]

Standoffs for now will make something sexier when I have more time

 

[CrabJoe StretchPants]

Badass!

I would try to find a cheap mobile lift table to mount the jig right to. Can adjust the height to be ergonomic for wherever you're welding, and rolled around for storage, etc.

Keep up the awesome work man!

 

[buckoW]

That is looking so good! You must be stoked.
What’s the first frame you are going to make with it?

 

[sikocycles]

Thanks.
I am thinking of a gravel bike or a fat bike.

 

[pizza diavola]

Thanks.
I am thinking of a gravel bike or a fat bike.

Reminds me of this

 

[sikocycles]

I am thinking of putting it on an engine stand so it can rotate or build something.

 

[sikocycles]

New welder day. Not a blue or red but it will do.

 

[buckoW]

Oh yeah!

 

[sikocycles]

Seat tube cone done.
next week I will complete the head tube cones and start with the BB spacers. Will tig practice this weekend.

 

[sikocycles]

God I hope I can build a frame after all this work.