Model 4 Precision Tapping Arm

Tapping arms keep taps level and supported. I designed this model specifically for using small taps, as small as m1, that will almost certainly break if used by hand. 

Video:
 

mag chuck video:
 

My smallest test with this tool was a m1 tap, which requires a .85mm hole. For me thats the smallest thing ive ever tapped and I cant imagine myself going smaller any time soon. 

Parts list:
tapping arm hardware:
m4 threaded insert x8]
m5 bolt, 16mm, x4
m6 coupling nut x4
m6 threaded rod, 180mm length
m6 threaded rod, 185mm length
m6 nut x2
m6 bolt, 110mm x2
lmu8 8mm linear bearing
8mm rod/ shaft, 10cm (adjust to your liking!)
handle material, I drilled a hole in the shaft and used 4mm rod, no one right way to do this
chuck of choice, I use a er16 colet chuck
2mm rod, 20mm lengths x3
concrete, aggregate removed
braided fishing wire