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Previous Prototype

Dual NEMA 17 motors

Lasercut Bracket

Lazy Susan

Lego wheels, approx 49.51 mm ~= 1.9"

Grooved Pulley Search on google:

https://www.google.com/search?q=grooved+pulleys&ie=utf-8&oe=utf-8

Amazon search

http://www.amazon.com/s/ref=nb_sb_noss?url=search-alias%3Dindustrial&field-keywords=round+belt+pulley

Round Belt Pulleys

http://www.mcmaster.com/#round-belt-pulleys/=y9zah9

http://mpcomponents.com/cms.php?mlink=Pulleys%20and%20Belts&cmsid=189

http://mpcomponents.com/products.php?cat=268

http://www.sdp-si.com/web/html/drivesystems.htm

https://sdp-si.com/eStore/Catalog/Group/226

• For round belt, diameter 0.125"
• Closest bores are:
• 0.2496 inches (too big for NEMA17 without bushing)
• 0.1873 inches (too small for NEMA17)

Cool, but in the UK:

http://www.motionco.co.uk/pulleys-belts-round-belt-pulleys-c-25_37.html

Grainger's are mostly too big:

http://www.grainger.com/category/v-belt-pulleys/sheaves-and-pulleys/power-transmission/ecatalog/N-hxd

0.250" bore, brass: http://www.amazon.com/Boston-Gear-Grooved-Smaller-Diameter/dp/B004NYA2LG/ref=sr_1_4?s=industrial&ie=UTF8&qid=1438301472&sr=1-4&keywords=round+belt+pulley

could be searched deeper:

http://www.rapidonline.com/electrical-power/aluminium-v-belt-pulley-30mm-6mm-bore-50-8986

not so hot:

http://www.northerntool.com/shop/tools/category_lawn-garden+lawn-mowers+belts-pulleys

http://industrialsuppliesstore.net/shop/pulley

V Belt Pulleys

https://sdp-si.com/eStore/Catalog/Group/549

NEMA 17 dimensions

http://www.reprap.org/wiki/NEMA_17_Stepper_motor

http://www.numberfactory.com/NEMA%20Motor%20Dimensions.htm

Motor shaft diameter = 5.0mm or 0.1968"

NEMA 23 dimensions

http://www.numberfactory.com/NEMA%20Motor%20Dimensions.htm

Shaft diameter: 0.250"    Is this too big to fit a 0.2496" bored pully?

NEMA23 Motor

http://www.linengineering.com/stepper-motors/5704.aspx

Shaft size: 0.2498 +.0002 -0.0003 This might fit.  Maybe heat would have to be used!?

more NEMA 23 on Lin: http://www.linengineering.com/contents/search.aspx?q=nema23

Overview of various NEMA 23s on reprap: http://www.reprap.org/wiki/NEMA_23_Stepper_motor

Cello Body and Case Dimensions

http://www.stringemporium.com/images/accord-cello-case-measurements.jpg

https://www.pinterest.com/pin/424534702346816251/

raw image searches:

https://images.search.yahoo.com/images/view;_ylt=AwrB8pw.K7lVWXsATQAunIlQ;_ylu=X3oDMTIyaTdkbnBsBHNlYwNzcgRzbGsDaW1nBG9pZANkY2FmMzZkNjVmNDhhMjU5MTI2NmEwNjk4M2QwM2I3YQRncG9zAzEEaXQDYmluZw--?.origin=&back=https%3A%2F%2Fimages.search.yahoo.com%2Fyhs%2Fsearch%3Fp%3DCello%2BMeasurements%26fr%3Dyhs-mozilla-001%26hsimp%3Dyhs-001%26hspart%3Dmozilla%26tab%3Dorganic%26ri%3D1&w=742&h=742&imgurl=www.violins.com.au%2FEbayImages%2FCelloMeasurements_Ebay.jpg&rurl=http%3A%2F%2Fwww.ebay.com.au%2Fitm%2FNEW-Kreisler-White-Fiberglass-Hard-Cello-Case-4-4-Full-Size-Cello-With-Wheels-%2F160971190114&size=117.2KB&name=...+White+Fiberglass+Hard+%3Cb%3ECello%3C%2Fb%3E+Case+4%2F4+Full+Size+%3Cb%3ECello%3C%2Fb%3E!+With+Wheels&p=Cello+Measurements&oid=dcaf36d65f48a2591266a06983d03b7a&fr2=&fr=yhs-mozilla-001&tt=...+White+Fiberglass+Hard+%3Cb%3ECello%3C%2Fb%3E+Case+4%2F4+Full+Size+%3Cb%3ECello%3C%2Fb%3E!+With+Wheels&b=0∋=112&no=1&ts=&tab=organic&sigr=13mhv1rrv&sigb=140h37sli&sigi=11ok20b0d&sigt=12jnq67lc&sign=12jnq67lc&.crumb=M28YAUblLdf&fr=yhs-mozilla-001&hsimp=yhs-001&hspart=mozilla

https://images.search.yahoo.com/images/view;_ylt=AwrB8pw.K7lVWXsAZAAunIlQ;_ylu=X3oDMTIzdjV0ajk3BHNlYwNzcgRzbGsDaW1nBG9pZANkNmRlMGMxOTFkMTM4NjBlYThmZjZmN2E5NDJlMTFlYwRncG9zAzI0BGl0A2Jpbmc-?.origin=&back=https%3A%2F%2Fimages.search.yahoo.com%2Fyhs%2Fsearch%3Fp%3DCello%2BMeasurements%26fr%3Dyhs-mozilla-001%26hsimp%3Dyhs-001%26hspart%3Dmozilla%26tab%3Dorganic%26ri%3D24&w=575&h=800&imgurl=www.minehara.com%2Fshowcase%2Fhosco%2Fcello%2Fcase_size2.gif&rurl=http%3A%2F%2Fwww.minehara.com%2Fshowcase%2Fcelloshop%2Fcellobag.htm&size=35.4KB&name=%E4%B8%8A%E8%A8%98%E3%81%AE%E5%AF%B8%E6%B3%95%E3%81%AF%E3%80%81%E3%82%B1%E3%83%BC%E3%82%B9%E5%86%85%E5%81%B4%E3%81%AE%E6%A6%82%E7%95%A5%E5%AF%B8%E6%B3%95%E3%81%A7%E3%81%99%E3%80%82+%E3%83%AD%E3%83%83%E3%83%88+...&p=Cello+Measurements&oid=d6de0c191d13860ea8ff6f7a942e11ec&fr2=&fr=yhs-mozilla-001&tt=%E4%B8%8A%E8%A8%98%E3%81%AE%E5%AF%B8%E6%B3%95%E3%81%AF%E3%80%81%E3%82%B1%E3%83%BC%E3%82%B9%E5%86%85%E5%81%B4%E3%81%AE%E6%A6%82%E7%95%A5%E5%AF%B8%E6%B3%95%E3%81%A7%E3%81%99%E3%80%82+%E3%83%AD%E3%83%83%E3%83%88+...&b=0∋=112&no=24&ts=&tab=organic&sigr=11nh1k656&sigb=141o5j8v4&sigi=11km3ffif&sigt=12a5t0tjp&sign=12a5t0tjp&.crumb=M28YAUblLdf&fr=yhs-mozilla-001&hsimp=yhs-001&hspart=mozilla