I made the machine is, in essence, MICROTEL, because it does not have a flexible shaft. It’s light and compact, at the same time a significant simplification of the structure did not reduce its capacity.
The drive of the working tool from the electric motor PDM-30-N1-01, but you can use any other engine series PDM-30 and PDI-25. Case 7 (see figure) is recommended to grind aluminium alloy; for its fixing to the motor the holes are drilled on the lid the latter, as in the conductor. The spindle consists of two parts: the intermediate shaft and the shank of the collet. The order of Assembly of the spindle as follows: first, on the diameter of the shank 5 is pressed on the bearing, then the connecting thread M5 is coated with glue BF-2 or primer AK-070, and then the shank screwed into the axial bore of the shaft 6. In the manufacture of spindles and collets is necessary to pay attention to the surface of rotation was coaxial: permissible runout should not exceed 0.03 to 0.05 mm.
Longitudinal tensioning provides the locknut 8. The motor shaft and the intermediate shaft 6 mounted with a locking pin made from a paperclip and curved in the form of letters; for him at the motor output shaft drilled hole Ø 1 mm.