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RIGHT-ANGLE Used where end frame, fan, etc., would interfere with crossfeed handle.
The Martindale Commutator Grinder assures concentricity of the
commutator or slip-ring by precision grinding while it is turning in its own bearings at
operating speeds and temperatures, with centrifugal force holding each bar in place.
Tool can be quickly changed from right to left hand
operation. The right-angle driving shaft is removed and inserted in the other side if
the right-angle housing, and the grinding Head cross-slide turned around. |
| When grinding use 2" ×
2" × 8" Commstones in any of the 5 grades shown and described under
Abrasives: Commstones, Brush Seaters, Sanding Bands, etc.; Commstones (General
Information) and Commstones (Commutator Resurfacing Stones). The stones will grind
1" beyond the grinder base at each end. and they can be cocked to get into the corner
at the riser. If very deep grooves must be removed, the Fig. 5
Turning Tool Head may be used. It is interchangeable with the Grinding Head on
either Fig.1 or Fig. 8. The tool holder should be positioned as indicated in the
upper left corner of this page. The top of the commutator should rotate away from
the operator so that if the mounting should slip, the tool bit would be pushed away from
the commutator instead of digging in. It is necessary to add 4" to the grinder
base length when using the Turning Tool. |
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The Round Stud Supports are
both drilled 1-1/4", and fibre bushings are provided for bushing the hole in the
support to the diameter of the brush stud. The bushings also serve to insulate the
Grinder when used on live brush studs. Adjustable Wedge Blocks
usually can be mounted on the brush arms in the same holes by the same stud bolts that
fasten the brush holders, as shown in the illustration to the left.
- Grinders 16" or less require 2 supports
- Grinders 18" to 34" require 3 supports
- Grinders 36" and over require 4 supports
Grinder bases have mounting holes (3/8" - 16 thread) on
2-1/4" centers across the base and on 2" centers along the base for
mounting supports.
A variable speed gear-motor controlled by a full-wave SCR control is
attached to either Fig. 1 or Fig. 8 grinder by a positive drive
coupling. A reversing switch, mounted on the carriage, is operated by
adjustable stops mounted directly to the bed casting providing positive
drive to the carriage. |
 Extension
Handle |
This extension can be
supplied in a 6" or 10" length to extend hand-wheel past brush rigging or other
obstruction, when necessary. |
|
Power-Drive
Reduces tedious labor; speed up the job. |
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Power-Drive eliminates the need for
the operator to hank crank the head back and forth across the face of the commutator. |
Weights: Net 29 lbs., Shipping 38 lbs; add about 2 lbs. for each additional
inch. Power Drive unit, Net 27 lbs., Shipping 32lbs. |
|
| Grinders: (Carrying Case included
with grinders below) |
Catalog Number |
| Right-Angle Grinding Tool, w/
10" base or less |
GRDR400* |
| Right-Angle-Turning Tool, w/10" base
or less, with Fig. 5 Head instead of Grinding Head |
GRDR401* |
| For Grinders 10" to 26": add per
inch over 10" |
GRDR666 |
| ( Grinder prices 28" and over on
application.) *Add base length to P/N when ordering (i.e.:"10",12", etc.) |
| Power-Drive and Accessories,115V., 60 Hz |
GRDR501A |
| 230 V.,50 Hz. |
GRDR501B |
| Turning Tool Head (Fig. 5), including Tool Holder |
GRDR505 |
| Supports: |
|
| Fig. 2 "L" Support |
GRDR50202 |
| Fig. 6 Wedge Block |
GRDR50206 |
| Fig. 9 "T" Support |
GRDR50209 |
| Extension Handles (Fig. 7): |
|
| 6" |
GRDR50306 |
| 10" |
GRDR50310 |
| Commstones for above: |
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| 2" × 2" × 8" Plain Lathe Type |
COMM204** |
| ** When ordering, specify cat. no. and
grade (i.e. EC, C, M, F, EF) (See description under Abrasives/ Commstones) |
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