To all the Eustathios builders out there. Any of you use alternative more affordable gt2 pulleys outside of the original BoM? In particular the high torque 32t pulleys that need to be purchased from Misumi. Does it have to be 32t?
Is there’s an alternate BoM out in the wild that’s can be sourced easier? I’m not trying to nickle and dime the build, but if I can save some money, I would like to know!
I suggest you drill out a pulley and install you own grub screw. Ive done this in the past by drilling a hole in the aluminium pulley with 2.5mm bit, then tapping it out with a 3mm hardened steel machine screw and loads of cutting fluid. You have to back it out a lot but I couldn’t be bothered to go the the store and by a 3mm tap. You then jsut repalce the screw with a standard 3mm grub.
@Oliver_Schonrock The cost of these pulleys is another reason I’m working on the Procerus.
@Oliver_Schonrock I thought about turning off the shoulders from the RobotDigg 32t pulleys but I do not have the machinery to do this. I would have to send it to someone I know out in Wisconsin (im in S. California) that would be willing to do it for me after first waiting a month or more for the pulleys to arrive from China (if they arrive). Personally I would prefer to dump the $112 from the 7 required pulleys on high end bearings/shafts/lead screws.
Would replacing these “odd” pulleys with more standard ones do anything to the build other than reduce the build volume slightly? Is there some other drastic change that would be needed? I mean, looking at the Eustathios design, could a simple spacer shim be added to shaft mounts?
If you have Sketchup (free at Sketchup.com) you can view the Eustathios design here:
https://github.com/eclsnowman/Lien3D_Eustathios_Spider/tree/master/Other%203D%20Formats
@SirGeekALot Thank you, I already have that covered and been using SpaceClaim to review @Eclsnowman 's model (awesome btw).
I do have a question for you all regarding the Lead Screw configuration from Misumi. Since Misumi discontinued the “S56-Q8” configuration and the only way to obtain the required step length is by adding a 3mm Keyway. Would this configuration be ok MTSBRB12-410-S56-Q8-C3-J0 ? “J0” is the placement of the keyway from the end of the rod which I had set to 0.
@Oliver_Schonrock maybe some of the misumi pulleys can be replaced with pulleys with shoulders? http://i.imgur.com/mWBh0ex.png
@Isaac_Arciaga a rod, drill, and hacksaw blade can easily remove the shoulder. Lock the rod in the drill. The pulley on the rod. Then as it turns use the saw like a cut off tool and done.
Put a hole in two of the bearing mounts, extend two of the shafts, and move the drive pulleys/motors to the outside like HercuLien. Then all robotdigg pullies could be used, as well as the cheaper and smaller closed loop belts from robotdigg.
@Eclsnowman Thanks! I’ll give that a shot in your SpaceClaim model. I ordered the pulley’s from RobotDigg. I can always fall back on the Misumi’s if it doesn’t work out.
Has anyone done a SyncroMesh version? I would actually spend the money on something like that vs the Misumi pulleys 
Adafruit has really affordable pulleys. Just note that theoretically GT2 is not the same as 2GT that Misumi carries, so best not to mix and match
@Paul_Sieradzki how are they different?
I’m not actually sure! I was just told by Misumi that they don’t recommend mixing and matching.
@Paul_Sieradzki Thanks for the tip on adafruit! I’ll take a look there as well! They accept Bitcoin (I need to spend mine)