GRINDER CHANGES BY YEAR & SERIAL NUMBER
2005-2007
#37 or so on – distance between bottom of middle plate and base plate increased from 5 5/16” to 5 11/16”. [Dec ‘06] This can be easily measured as the vertical dimension of the lower vertical.
#48 – shipped with scale for optional customer fit. [June ‘07]
2008 #73 - 108
#98 – thicker felt pad feet to reduce noise for consumer kitchen counter.
2009 #109 - 135
#121 – added bottom funnel clips. [June ‘09]
#127 – changed to red adjustment lock knobs. [Sept ‘09]
#134 – bottom funnel texture changed and added food safe wax. To help prevent grounds retention. [Dec ‘09]
2011 #175 - 236
Build 48 Dec. 2011 #234 – bad burrs. Bradbury’s couldn’t grind fine enough. [Dec ‘11] Sent back to us; we tracked down problem and fixed it.
Several other grinders from that time also had the problem of not being able to grind fine enough – all resolved with replacement burrs. The manufacturer allowed too great an exit hole for the grounds.
2012 #237 - 331
Build 60 Late Aug 2012, #299 onwards Big pulley/shaft bolt torqued to 200 in/lbs.
2013 #327 – 387 [except 331 which was incl. in 2012]
Build 73 June 2013 # 356,7,8,9 – and onwards. Shafts pressed into bearings, checked for run out. Glued into top plate. Recheck run out. Top of grinder frame dowelled together within .002”. From this time on, misalignment is not possible unless the machine is damaged (even shipping dropping wouldn’t alter alignment). Radial run out within .003” TIR, axial within .0004” TIR.
2016 #522 - 572
Build 114, Nov., #555 onwards 17-4 ph stainless steel small pulleys. Quite hard. The original design of knurled aluminum pulleys were found to be wearing the knurling. The new pulleys will last a very long time.
2017 #572 - 621
Build 128, Nov., #612 on - tighter belts, slight increase in speed to 550 rpm. To provide better grinding with light roasts.
2019 #700 -on
Now renamed M4. Incorporates new motor speed control circuit board. Speed 480. Dual belt system. SSP burrs as standard. Cosmetically revised top funnel.
