Messages

301

The Bike Shop / Re: 3D printed titanium parts

« on: February 06, 2014, 04:45:00 PM »

I just want to see ti sprockets priced the same as aluminum ones again...

When did that ever happen?

"World's first 3D-printed titanium bike is super strong and incredibly light -
Empire Cycles' MX-6 prototype is a third lighter than normal metal bike frames, and four times stronger than the most stringent tests demand – this is the future of pedal power"

At the risk of bringing down Farva's ire... bonded titanium frames dont have the best track record of staying bonded... having said that, if they were smart they could have 3D printed the joints with a really big surface area to maximise the bond area...


G.

302

The Bike Shop / Re: 3D printed titanium parts

« on: February 04, 2014, 02:45:20 PM »

G, would you be able to do that honeycomb interior with a cast part?

In the video of the dropouts he specifically claims that they couldnt have made those dropouts any other way and yet that is rubbish. You could investment cast them for a relatively low tool cost.

i clicked on this topic specifically to see the rant that i knew you would put in here.  You dont know that for a fact, that is speculation.  Just because you have some sort of cut rate 3-d printer at home doesnt make you any kind of expert in the field, nor does reading about it in forums or internet articles.  Any time i see a topic about something new that you are doing it is you talking about how it is the best thing around and every time i see a topic about a new process that you didnt adopt it is bashed on or questioned.  get over yourself.

So you are freely admitting that your only reason for posting in this thread is to troll?... and you call MY post a rant?


G.

is that not exactly what i called you out for doing.  G views thread topics... "what can i try to correct people on"

Yes it is, but:-

1. You are wrong.

2. You are being a troll, and a hypocrite and adding nothing of any worth to the thread.

Also, my post was a year and a half ago so if you managed to go this long without showing any interest then it rather suggests that it isnt a subject you are very interested in. I very much doubt that this website needs your half-arsed, 17month late "policing" of my input, so why not get over YOURself?


G.

303

The Bike Shop / Re: 3D printed titanium parts

« on: February 02, 2014, 03:26:29 PM »

Make one of these, George...

"Video of Low-Cost Open-Source 3D Metal Printing v.1 2013"

Open access: https://www.academia.edu/5327317/A_Low-Cost_Open-Source_Metal_3-D_Printer

Free designs: http://www.appropedia.org/Open-source_metal_3-D_printer

Sigma Labs & Michigan Tech to develop low cost 3D metal printer

Dec.23, 2013

Sigma Labs, a developer of real-time quality inspection systems for 3D metal printing, today announced the development of technology to support a low-cost, 3D metal printer based on arc welding technology. As part of this initiative, Sigma Labs has entered into a Memorandum of Understanding (MOU) with Michigan Technological University (Michigan Tech) to collaborate technically in the development of technology for a low-cost, 3D metal printer for near-net shape parts that require only 3- or 5-axis machining to take the parts to final form.

"Michigan Tech has recently developed an open source 3D printer based on gas metal arc welding technology. Sigma Labs has a unique knowledge base in advanced sensing and process control for gas metal arc welding." said Mark Cola, President and Chief Executive Officer of Sigma Labs.

Sigma Labs, Inc. has two wholly-owned subsidiaries – B6 Sigma, Inc. and Sumner & Lawrence Limited (dba Sumner Associates). B6 Sigma develops precision manufacturing solutions and advanced materials technologies, as well as R&D solutions.

"Along with strategic partners, we intend to develop, test, and launch a customized, low-cost 3D printing solution for metals like titanium, steel, aluminum, and nickel-based alloys." Cola states. "Our low-cost printing technology is directly focused at servicing the currently untapped market of tens of thousands of users presently dissuaded by the high-cost, barriers to entry of 3D laser powder-bed solutions. Lastly, we have identified manufacturing sources capable of producing our low-cost 3D printing technology."


You Can Now 3D Print with Metal at Home

Scientists build a $1,500 open-source 3D metal printer

...and then burn your house down

That looks promising. Be interesting to know what the resolution is like. The sample sprocket they have there has a big gap in it where the slicing software has "decided" that there isnt room for another perimeter which is like what happens when you print small sprockets on any machine where the resolution is a bit low for the part, so suggests it is very early days and very low res., but be good to play with. $2k is probably a bit on the optimistic side given that a cheap MIG welder would probably burn out after 10mins of continuous use like this (unless that price doesn't include the welder). 


G.

304

The Bike Shop / Re: 3D printed titanium parts

« on: February 02, 2014, 03:18:28 PM »

G, would you be able to do that honeycomb interior with a cast part?

In the video of the dropouts he specifically claims that they couldnt have made those dropouts any other way and yet that is rubbish. You could investment cast them for a relatively low tool cost.

i clicked on this topic specifically to see the rant that i knew you would put in here.  You dont know that for a fact, that is speculation.  Just because you have some sort of cut rate 3-d printer at home doesnt make you any kind of expert in the field, nor does reading about it in forums or internet articles.  Any time i see a topic about something new that you are doing it is you talking about how it is the best thing around and every time i see a topic about a new process that you didnt adopt it is bashed on or questioned.  get over yourself.

So you are freely admitting that your only reason for posting in this thread is to troll?... and you call MY post a rant?


G.

305

The Lounge / Re: What have you made?

« on: January 27, 2014, 05:06:06 AM »

anyone worked with carbon before?

just impulse purchased a bunch of carbon fibre cloth and tubing. gonna have a crack at building some small accessories for some of my bikes, and the big project which will be a pair of lightweight racks for my road bike so i can do some light touring this summer. haven't messed about with much anything in a while so I'm itching to get dirty.

Not yet, but I have some projects in mind.
Be very interested to see how it works out for you, keep us posted.


G.

306

The Lounge / Re: RIP Brian Itzaina

« on: December 17, 2013, 04:38:32 PM »

Damn shame all round. RIP


G.

307

The Bike Shop / Re: Quick Questions

« on: December 06, 2013, 07:13:11 AM »

It is obviously pretty hard to grip and I assume it doesnt have anything you can get to behind? You can try to find a bolt that just fits in and angle it sideways (or weld something to it)' then stick it in the oven at a lowish heat 150C maybe. The aluminium body should expand significantly compared to the steel race and with luck you will be able to get it out.


G.

308

The Bike Shop / Re: Quick Questions

« on: December 04, 2013, 04:43:21 PM »

So tell me.  Who knows where I can find 180mm rainbow ti spokes?  Can't seem to find anything smaller than a 182.

Buy 182mm
Cut off 2mm
Re-thread them
? ? ?
Profit

This doesn't work.

You need to buy a spoke that is long enough that you can cut off ALL the thread and then re-thread the remainder. So in this case some 190mm+ (assuming they have a standard 9-10mm of thread).


G.

309

The Lounge / Re: What have you made?

« on: December 03, 2013, 09:18:30 AM »

Here's how you should never build a shed: http://imgur.com/a/wixkx/layout/blog

Fuck, that is bad.


G.

310

The Bike Shop / Re: Quick Questions

« on: November 19, 2013, 03:31:35 PM »

Anyone know what the cheapest replacement cassette driver I could get for my Model C is? Was gonna buy tee's 33t tree sprocket but I think it'll make my gearing stupidly hard to ride with the current driver considering it's 27t sprocket at the minute. Or, how would a Model C with 33t up front be? I want to make it a bit harder and faster but a 6t jump might be a bit much.

Are you sure it is 27/10 now? They usually come stock with 25/10 (and I have 22/10 on mine)

25/10 is like 27/9 on a 20"
27/10 is like 29/9 on a 20"

What would you use with the 33? Even 33/11 would be 32.5/9 on a 20"


G.

311

The Bike Shop / Re: What did you do to your bike today? (v2)

« on: November 16, 2013, 06:13:12 PM »

putting the stoppers back on, and found out evo 2's wont clear a fly 2.125 on an S&M stricker

Probably down to the boss spacing rather than the caliper, though switching out the pad spacing is often all it takes to get the space you need.


G.

G,

the tire was rubbing the arms off of the boss. No worries found out springfields fit the bill. Ordered up and ready to roll. I can post a pic of the tire rubbing if you want

No that's cool, thanks for the offer though.

If it is rubbing the arms at the large diameter bit around the boss then the Springfields are about your only choice and will give you another 2mm each side.


G.

312

The Bike Shop / Re: What did you do to your bike today? (v2)

« on: November 14, 2013, 08:31:32 AM »

putting the stoppers back on, and found out evo 2's wont clear a fly 2.125 on an S&M stricker

Probably down to the boss spacing rather than the caliper, though switching out the pad spacing is often all it takes to get the space you need.


G.

313

The Bike Shop / Re: Quick Questions

« on: November 03, 2013, 02:44:05 PM »

^^^ Are you kidding?

Maybe you have a problem with your bosses or cable, they should feel awesome (unless you have a weird preference)

I think they're awesome for people who have no idea what they're doing. I like my spring tension wayyyy lower though. I know you can stretch/change the spring but that's way more hassle than just not turning something too much.

I like low spring tension too. It took me approx 0.4seconds to pull the arms apart enough to stretch out the spring a little and get it how I like... definitely less time consuming than trying to balance the arms.


G.

314

The Bike Shop / Re: Quick Questions

« on: November 01, 2013, 06:04:35 PM »

Heard only good things about Empire, so thinking of ordering a bunch of stuff from them to the UK, anyone have any experience with this? (shipping times prices etc)

Empire are rock fucking solid, you need have no worries at all on that.

Whether you get stung for customs is down to luck and value. If you are ordering several hundred quids worth then it may well get charged and wont be within your "allowance". Smaller cheaper items are both less likely to get charged and more likely to slip through.

Obviously UK distributors and shops are loosing out on business though and distributors are unlikely to support warranty, so factor that in to the price as well as possible duties.

If you have a relative or friend in the US (even if they are just visiting for a few weeks) then get it shipped to them and they can ship it on to you as a "gift" (or bring it back on the plane)...

In the old days, UK BMXers would put together a load of orders and then someone would go out and ride for a few weeks (often not taking a bike but building one there and bringing it back) and essentially get a free holiday. There is obviously the need to go through the "nothing to declare" lane when you get back, but if the bike is already built and looks used then you are likely to be fine..


G.

315

The Bike Shop / Re: Quick Questions

« on: October 31, 2013, 06:33:48 PM »

^^^ Are you kidding?

Maybe you have a problem with your bosses or cable, they should feel awesome (unless you have a weird preference)

Anyone hook up odyssey Springfield brakes for frontbrake use? I saw the new fairdale bikes have them but didn't really get to check it out. So over having to adjust shit.

I have done it. Takes a bit of fiddling but not a huge amount. Cut slot deeper for cable to fit through smoothly.


G.