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Interchangeable Heads for Martindale Mica-Millers

     The three Martindale Mica-Millers are the results of continuous research and "on-the-job" testing in an effort to make the most serviceable all-around portable mica undercutters possible.
Three Models
     This versatile tool is available with three different power sources; Model K (direct drive electric motor), Flex-Drive (flexible shaft), Air-Driven (air motor), to meet the requirements and preferences of all electric repair shops and maintenance departments.
Three Interchangeable Heads
Also available for use on any of the three models are three interchangeable heads which make it possible to use the Mica-Miller with saws or "V" cutters ranging from 23/32" diameter to 1-1/4" diameter to undercut a wide range of commutator sizes.  All three heads are equipped with depth gauges.  The two smaller ones have slot guides and the Heavy-Duty head has roller supports.  Standard and Heavy-Duty heads have ball bearing spindles.
     The "Small" head allows undercutting closer to risers than has been possible before.  The "Standard" head is for all-around use, while the "Heavy-Duty" head, with its larger and more rugged parts, will withstand hard usage on larger commutators.  To change from one size head to another it is necessary only to remove one screw, change heads and replace screw.

Three Interchangeable Heads

(Left) only 1-7/8" wide (less Slot-Guide). Uses 23/32" or 3/4" diameter × 5/16" hole Saws or "V" cutters.

(Above) 2-1/4" wide
(less Slot-Guide). Available for use with 7/8" or 1" diameter × 5/16" hole, or 25 mm. diameter × 7mm. hole Saws or "V" cutters.

"Heavy-Duty" Head
(Left) 4/1/4" wide overall.  Uses 1-1/8" or 1-1/4" diameter × 3/8" hole Saws or "V" cutters.

     All Mica-Millers are light-weight, sturdy, and carefully   balanced.  These qualities give the operator immediate confidence in the tool and his ability to undercut rapidly without fatigue.
     When Undercutting, start at the riser end of the commutator and pull the tool towards you.

Saws and Cutters for Martindale Mica-Millers
(High-Speed Steel)

Type Number O.D. Hole Catalog Number


14-HS Saws 23/32" 5/16" HSMS14
15-VHS Cutters 23/32" 5/16" HSMSV15
65-HS Saws 3/4" 5/16" HSMS65
65-VHS Cutters 3/4" 5/16" HSMSV65


75-HS Saws 7/8" 5/16" HSMS75
75-VHS Cutters 7/8" 5/16" HSMSV75
85-HS Saws 1" 5/16" HSMS85
85-VHS Cutters 1" 5/16" HSMSV85
25-HS Saws 25 mm. 7 mm. HSMM25
25-VHS Cutters 25 mm. 7 mm. HSMMV25


96-HS Saws 1-1/8" 3/8" HSMS96
96-VHS Cutters 1-1/8" 3/8" HSMSV96
106-HS Saws 1-1/4" 3/8" HSMS106
106-VHS Cutters 1-1/4" 3/8" HSMSV106

     The table at right lists at least 2 diameters of saws and cutters for each of the three interchangeable M-ca-Miller heads.
     Saws ("U" slot) are stocked in the following thicknesses (thousandths of an inch): 15, 18, 20, 23, 25, 26, 28, 30, 32, 35, 38, 40, 43, 45, 50, 53, 55, 58, 60, 63, and 65, and can be supplied in other thicknesses at a slight additional charge. (Standard metric thicknesses available.)
     V-cutters ("V" slot) are all .045" thick and are stocked with 40°, 50°, and  60°, angles between cutting edges.  40°, cutters are generally used for thin mica, 50° for medium mica, and 60° for thick mica. 

Steel Carrying Cases
Heavy gauge steel carrying cases to protect your Model K, Air-Driven or Flex-Drive Mica-Miller, extra heads, saws and cutters, accessories, etc., are available.

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