Weld Main Triangle - Mini Town Bicycle 07

[@Abe.Wassenstein]

Thanks Steve, another great video. Thanks for taking the time to film and share.

[@Pushyhog]

Beautiful jig fixture,, so hassle free getting frame in at out. 4:00 great weld tips.

[@Wezly]

Appreciate the tips on making tacks, made loads of sense 👌

[@PithyBikes]

Glad you appreciate it. I was worried it got a bit wordy. :)

[@aserta]

Suggestion, get a pipe belt grinder attachment for an angle grinder to grind the pipes. Takes much more uniform cuts, looks cleaner, and is easier to use. Most important part, depending on the geometry of the grinder attachment, the cuts are far less aggressive regardless of how fresh the belt is.

[@PithyBikes]

Just did a search for that, Awesome!! I see one in my future.

[@aserta]

You can bypass the issue of not seeing through your hood (where your tack is) by shutting down the lights in your workshop and using a cheapo tack-on LED light mounted to your helmet. It will light the subject of work sufficiently to allow you to see what you're doing, but the light won't be enough to trigger the sensors (it's not even pointed at them or is global). This makes life so much easier regardless of what style of welding you perform, TIG, MIG, or stick. Personally, i bought a cheapo single driver LED flashlight, took the driver out, stuck it to a piece of aluminium that i screwed to my helmet (for cooling). Used hot glue to mount the plastic lens in place for wide beam and it work brilliantly. Takes a bit to accept the notion of welding in the dark, but it sure makes for better weld line starts, ALSO, you can see your weld better, at least i do with my 3M which has quite sensitive lenses/sensors.

[@PithyBikes]

That sounds like a great idea! I'll try it out sometime.

[@zipzit2go]

Sensors? what sensors? Er, am I the only person using old skool plain jane hood with simple glass filter?

[@benc8386]

You ended the last video with "it's ready for tacking" and I nearly commented to say don't forget the vent holes but thought I won't say that because he definitely won't forget them!

[@PithyBikes]

Hahaha! Oh man you could have saved me so much work! :P :D

[@lewisdigital216]

Really enjoy your videos, those welding tips* are solid. Thank for sharing can't wait for the next one!

[@brewcity1834]

the same welds you criticize, are still better than my best, keep up the great work

[@PithyBikes]

You know how some people get on instagram and envy other peoples lifestyles? I'm that way, but with welds. ;)

[@andrel3]

Looking good! Thanks for the regular vids

[@davidrichner6840]

Wow. You continue to inspire. Concepts, production, detail...thanx

[@WildmanTech]

Great tips on tacking!

[@ScienceFTW]

Awesome as always! Great seeing your videos.

[@PithyBikes]

Thanks for watching!

[@nigelnightmare4160]

Personally I'd have sacrificed the head tube and left the top and down attached to the seat post. You only need one vent hole per tube. Good practice as you said though.

[@scrubby0]

Thank you for the tacking tips!

[@sweenep86]

Admire your tenacity to correct errors but IMO you really needn’t have cut those tubes out. You only need a vent hole 1.5mm to limit the weld blowing out. A small hole on the underside of the tube or one drilled straight through the headstock tube and welded up after would have sufficed. You’re correct there’s no value in purging steel, waste of argon, you only purge stainless and titanium. If it’s 4130 chrome moly tubing read up on normalisation after welding.

[@SpeedLockedNZ]

So are the vents are only there for welding? (To very gas & heat), & can they be closed after?

[@PithyBikes]

@@SpeedLockedNZ There's varying opinions on vent holes. I haven't seen any scientific evaluation done it it though. I've only heard different ways of doing it. I use the holes to vent moisture and avoid corrosion.

[@bradley3549]

@@PithyBikes If moisture can't get in, it doesn't need to get out. The frame is going to outlive you I'm sure!

[@Mekhanic1]

Great to see you again my friend! =)

[@PithyBikes]

Great to see you still following the channel!

[@crazyjunkcreation]

Hai bro. Im also trying to make my own custom bicycle. Yur videos r helpful for me. Thanks...

[@PithyBikes]

Glad they're helpful!

[@WildmanTech]

How is your engagement? I am captivated. Is that typical?

[@tgroberts]

Awesome

[@theflubbybear]

Would it not have been possible/practical to drill a hole straight through the head tube, bb, and seat tube and use those + some files to make a head tube design (in place of a head tube badge), a bb water reliever / bb design (like some older frames have), and a decorative seatclamp hole (not sure what this gap is called, but the slit/hole cut in the seat tube for the seatpost to fit + clamp to work)? I'm not sure if this would be practical or possible, but it's just what I first thought of and I'm just curious to know if it would have been a good idea in this case. Of course that's assuming this is a frame for you or a family member. If it's a custom frame for a customer, of course those "additions" wouldn't be practical unless specifically asked for

[@max03tube]

Beautiful video, thank you for all the efforts.

[@Ledrefoc1]

Nicely done and glad to see you did went back and fixed it the correct way. Are you planning on or have you considered making your own fork and stem? I'd love to see how you went about it.

[@hudmut]

A Boring head for the mill will save a lot of time and will all so let you rebore head tubes after welding for bearing cups.

[@martinkiszel8903]

What material is the tube? Very nice job, learnt a lot watching you.

[@aminegc9353]

What is the grade of steel used to make frame bike? I need the kind of steel used exactly please . For exemple the steel used in steel construction is S235 S355 ...

[@ghicione]

Will a automatically darkening welding helmet help with the startup?

[@PithyBikes]

I started out with one auto darkening and yes, they're great for tacking I think. But I converted to a shade 9 gold filter. They're just so amazing for seeing the weld clearly. Highly recommended!

[@小喇叭-u3x]

很喜歡看你製作腳踏車

[@PithyBikes]

谢谢！

[@ryanpeterson1664]

​@@PithyBikes 什麼時候要推出說著國語製作單車的影片呢？

[@simonbrum2186]

Nice video and nice bike ! What amperage are you using for welding ? What is the thockness of the tube ?

[@SpeedLockedNZ]

Try a Sewing Machine Peddle, for dremal, just check wattage 1st, cheap peddles are too flimsy & light

[@PithyBikes]

I was able to find some pretty affordable foot switches on Amazon. But I've had that dremel for over 20 years now. I think its time to upgrade to a cordless one!

[@VegasCyclingFreak]

As someone who doesn't know how to weld, that looks fantastic to me. Why do you need the vent holes?

[@PithyBikes]

If the tubes aren't vented they will hold moisture and eventually weld from the inside. But its also quite handy if some shard knocks loose inside the tube, you can usually shake it out the vent!

[@nostamine2567]

Why dont you weld it on a stand ? It will be much easier . Companies that make bmx parts do it this way all the time and parts are coming out perfectly and production time is shorter

[@yeonhocho2053]

Can you make a jig that's only made out of 3d printed objects(pla)?

[@PithyBikes]

Yeonho Cho probably yes. But only for TIG welding. Brazing would melt it. Main frame would still need to be something rigid like Alu or steel.

[@cup_and_cone]

Downtube could have been saved by drilling it for bottle cage rivnuts?

[@PithyBikes]

Unfortunately, it got pretty beat up when I removed it though. Clean up on ends would have made it too short. :(

[@ryanpeterson1664]

@@PithyBikes I think he meant the bottle cage holes could have acted as your vents, in which case you wouldn't have had to cut out the down tube.

[@shawnlund]

I welded up a part three times before getting it right. Welded it, saw that I screwed up, ground the weld out and welded it right back up the wrong way around...again.

[@PithyBikes]

Shawn Lund it happens! Good to hear you worked through it. 👍

[@benc8386]

DT would have been OK as it was vented at the BB. TT more of a problem... Could have made a last minute design change to go with internal cable routing and drilled a hole in the TT for that? Such bodgy thoughts probably unworthy of Pithy Bikes though :)

[@PithyBikes]

Hahaha! I considered some of those options mostly lying in bed that evening LOL.

[@Captivestormracing]

Still looks like a hard thing to do

[@phatpat6667]

could you have drilled the vent through the whole tube from the other side then welded the outer hole closed?

[@PithyBikes]

I could have but figured I had enough tubes to just start again.

[@midcenturymachine5307]

If it is an 'old school' rust prohibator, it is likely cosmoline....

[@SpeedLockedNZ]

Lots is of steel is coated in vegetable oil now, It's cheap, nontoxic & cheap

[@dizzybuizzy9347]

Why not get an Electronic Helmet - they're not that expensive, and since you have Lathes, Mills, Welding Machines, a Electronic Helmet would make things a lot Easier! I used to use, and still use Manual Helmets for Stick Welding, but after as I switched to TIG, I use nothing else but Auto-Helmets! Even today they run for about 200$

[@SpeedLockedNZ]

Murphy's law...The batteries always flat lol

[@dizzybuizzy9347]

So, when is the last time you did TIG Welding? @@SpeedLockedNZ

[@davidpayumo23]

I see a lot of pictures of bike welders and they use fixed shade helmets. They guys can use buy any helmet but they like fixed shade. At the United Bicycle Institute they only provide fixed shade helmets. The helmets are Jackson HSL 100. Another thing is cost. I would by the ESAB Sentinel Helmet but it's $300. The Jackson is $50. I use the Fibre Metal gold shade lens and it's neutral colour (no ugly green).

[@dizzybuizzy9347]

@@davidpayumo23 - I have 2 Optrel Helmets that I've been using over my Career as a TIG Welder, I still have the Fixed Lens Helmets that I use with Stick Welding (SMAW), simply because of Spatter, but Optrel is strictly for TIG. It allows for Assembly adjustments, Tacking, and Stop and Start Welding without having to handle the Helmet every time! Electric Lens Helmets are a Lifetime Purchase! I mean, when one divides 300$ by the years of use, it doesn't end up costing that much.. Anyways, to each his own!

[@davidpayumo23]

@@dizzybuizzy9347 I have always buying a welding helmet disease. I am Canadian so Optrel can be upwards of $500 in Toronto. After a while it gets expensive. I want the ESAB helmet still.