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Flex-Drive Mica-Miller

     Flex-Drive Mica-Miller should be overhead by means of its suspension ring, thus lessening operator fatigue and flexible shaft strain.
     The flexible shaft (No. 16; 3/8" diam., 5ft. long) of the Flex-Drive Mica-Miller is strong yet very flexible and transmits full power smoothly, without chatter or vibration.
     The three interchangeable heads described below are available for this undercutter.  The head mounts on a long slender drive shaft housing making the machines particularly valuable in close quarters as the head is the widest part of the undercutter.
Full load saw spindle speeds are as follows:
With "Small" Head - 3700/4300 r.p.m.
With "Standard" Head - 2850/ 3450 r.p.m.
With Heavy-Duty" Head - 1700/2300 r.p.m.

  Catalog Number
Flex-Drive Mica-Miller: 115 V., 50/60 Hz. 230 V., 50/60 Hz.
With "Small" Head & 5/16" arbor M-MU301A M-MU301B
With "Standard" Head & 5/16 or (7mm.) arbor M-MU302A or (7M) M-MU302B or (7M)
With "Heavy-Duty" Head & 3/8" arbor M-MU303A M-MU303B
Flex-Drive Mica-Miller with Flexible Shaft and
Swivel Connection for use with your motor:
Catalog Number
With "Small" Head & 5/16" arbor & 1/2" diam. Motor Connection M-MU40112
& 5/8" diam. Motor Connection M-MU40158
& 10mm. diam. Motor Connection M-MU40110MM
& 14mm. diam. Motor Connection M-MU40114MM
With "Standard" Head & 5/16" or (7mm. arbor) & 1/2"diam, Motor Connection M-MU40212 or (7M)
& 5/8" diam. Motor Connection M-MU40258 or (7M)
& 10mm. diam. Motor Connection M-MU40210MM or (7M)
& 14mm. diam. Motor Connection M-MU40214MM or (7M)
With "Heavy-Duty" Head & 3/8" arbor & 1/2"diam, Motor Connection M-MU40312
& 5/8" diam. Motor Connection M-MU40358
& 10mm. diam. Motor Connection M-MU40310MM
& 14mm. diam. Motor Connection M-MU40314MM
Extra Interchangeable Heads See Below
No. 16 Core (5ft.) (replacement for flexible shaft) MFLXD90
No. 16 Sheath (replacement for flexible shaft) MFLXD61
Steel Carrying Case, No. 2; for Flex-Drive Mica-Miller CASE102
Net Weight. with motor 25lbs., without motor 7lbs. Shipping Weight. with motor 27lbs., without motor 9 lbs.

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 Mica-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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