Helping someone who wants a Bafang Ultra Max drive. Since he can't weld this into a DIY aluminum frame, he's planning to bolt the mounting plate in the middle of a DIY steel recumbent frame as an intermediate drive. But that means he'll need an ISIS spider without a crankarm to attach to the Ultra Max to use as a timing sprocket to the front crank. Anybody know of any armless spiders? I know Maxarya has a similar spider since their bikes use a similar layout, but that one is square taper, not ISIS.
ISIS spider?
- Thread starter Timelord
- Start date
Best of luck wishes on your search. If you find this, please post a link for the benefit of others who are searching for the same thing. However, I fear you are looking for the proverbial left-handed green-eyed Unicorn...
Why not take an ISIS crankarm with spider, and cut off the crankarm part? (and then grind away any remnants to smooth it into whatever shape you might want)
I did this with square taper types years back when I built CrazyBike2's various middrives, though most of those were swaged-on chainrings, IIRC, the same would work with the bolt-on-the-spider type.
I did this with square taper types years back when I built CrazyBike2's various middrives, though most of those were swaged-on chainrings, IIRC, the same would work with the bolt-on-the-spider type.
I have designed this in CAD in the past.
I did not make the spider part was intending to use it for a very similar purpose. I followed the ISIS white paper to the best of my ability and I believe that I did it correctly but have never CNC'd a component from the design. So there fore I can not confirm that it is true.
The reason that I decided to design from scratch is because all the CAD drawings/free files I could find on the web (ex. Grabcad etc..) did not actually adhere to the design specifications according to my evaluation. And I didn't want to risk CNC one off prototype a paperweight in the end....
From memory, CNC a custom part like this would run a couple hundred $
The white paper
http://www.isisdrive.com/isisdrive/ISIS_Drive_Standard_Document_revD.pdf
here is a pic where I incorporated a 6 hole disc/cog spider
I did not make the spider part was intending to use it for a very similar purpose. I followed the ISIS white paper to the best of my ability and I believe that I did it correctly but have never CNC'd a component from the design. So there fore I can not confirm that it is true.
The reason that I decided to design from scratch is because all the CAD drawings/free files I could find on the web (ex. Grabcad etc..) did not actually adhere to the design specifications according to my evaluation. And I didn't want to risk CNC one off prototype a paperweight in the end....
From memory, CNC a custom part like this would run a couple hundred $
The white paper
http://www.isisdrive.com/isisdrive/ISIS_Drive_Standard_Document_revD.pdf
here is a pic where I incorporated a 6 hole disc/cog spider
