20140428 (M) Upcycled 3D Printer

Service Vs hammer

Today was unnecessarily expensive for two reasons.  The first reason is that I decided to buy a bicycle chain tool so I have it available for future projects.  The chain tool cost $9 at Bicycle Chain.  I could have used a hammer and nail to drive a link (pin) from the chain but this is a tool that should have already been in my tool box.  The second reason someone else could have done it cheaper is that I'm sure the guys at the bike store would have modified the piece of chain for me without any fuss.

Modifying the chain doesn't have to be expensive.  The store sold me a scrap for $1 and to show my gratitude I bought the chain tool from the same place.  Seems like a good exercise of consumer loyalty.

Enough background.

A chain tool was purchased from Bicycle Chain on Lexington in Roseville, MN.  The employee confirmed the tool could be used on any link of a bicycle chain.  The tool was $8.99 plus tax.

At the hack space the previously marked link (pin) was put in the chain tool and extracted.  The metal link was lost on the floor.  A second joint was separated to obtain another link.

 Chain in the chain tool

Chain tool has extracted a link
Second link pin between chain loop
The link was reinserted by using an alligator clip to position the link over the hole [of the chain joint] while in the chain tool.  Keeping the link straight proved difficult.  A hammer was used to drive the link most of the way and probably could have done all the work.  The chain tool was used to make the link flush with the chain again.

 Alligator clip positioning link pin

Chain tool working the pin into place
Another angle of the chain tool
Use a hammer to drive the pin into place

 Making the pin flush with the chain

The continuous chain fits loosely on all the sprockets.  A tensioner will be necessary and probably a rubber band and rag.

A loose fitting chain

The hole for the glue gun nozzle was widened slightly.  The nozzle now fits well.

The nozzle is now snug

To do:

  • Mount aluminum bar to plastic with countersunk bolts from below 
  • Design stripboard circuit, drill and wire 
  • Clean saw blade and glue to servo 
  • Mount glueServo 
  • Install in mint tin enclosure 
  • Test + debug 
  • Revise documentation
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