MARTINDALE HV-3 User manual

PO Box 430 Cleveland, OH 44107 • Phone [phone] • Fax Local 521-9476 / USA & Canada [phone]
E-Mail: [email protected] • Website: www.martindaleco.com
HV-3 BENCH-TYPE UNDERCUTTER
INSTRUCTIONS
INITIAL ASSEMBLY:
Turn the vertical adjustment hand wheel (30-30) over and tighten the set screw. Remove the
carriage stop screw with modified Black Tee Know from the end of the roller slide and install
the carriage assembly (30-2 etc) by inserting the carriage roller bearings into the notches of
the slides. Replace the stop screw with Knob. Three countersunk holes are provided for
screwing the base to a bench.
FOR SLOTTING HORIZONTAL COMMUTATORS:
Fasten the end of the operating handle (30-18) to the base of the carriage (30-2). Position
handle between dowel pins and thread bolt through spacer (30-21) into carriage base (30-
2).
FOR SLOTTING VERTICAL COMMUTATORS:
Fasten the end of the operating handle (30-18) to the bottom of the carriage lifting arm (30-
15).
CHANGING SAW SPINDLES:
To remove the spindle, first, remove the pulley guard (30-28). Loosen the two hollow head
set screws in the motor support bracket (30-3) that hold the spindle in position. Loosen the
tension on the drive belt and slip off the belt. Slide out the spindle housing along with the
pulley. When inserting the other spindle, push it through from the pulley side with the flats
in line with the set screw. Insert the spindle until the flats are under the set screws.
ALIGNMENT:
Fasten a 6" rule or other thin metal straight edge to the saw spindle in place of a saw
(between saw retaining screw and spindle end) with the end of the rule hanging down sev-
eral inches. Align the edge of the rule with the point of the center support and tighten the
saw spindle in this position with the 2 set screws.

PO Box 430 Cleveland, OH 44107 • Phone [phone] • Fax Local 521-9476 / USA & Canada [phone]
E-Mail: [email protected] • Website: www.martindaleco.com
SPINDLE SPEEDS:
When using Carbide Saws, the large pulley would be on the motor and the small pulley on
the spindle.
When using High Speed Steel Saws, the large pulley should be on the saw spindle and the
small pulley on the motor.
OPERATION:
FOR HORIZONTAL COMMUTATORS
Put a saw of the desired thickness on the saw spindle. Mount an armature on the V-supports
or centers. Place a bubble level (a combination square head works fine for horizontal or ver-
tical commutators) on the base plate dovetail, and match the setting on the commutator by
adjusting the front or rear height adjusting knobs (30-7). If the V-supports are
used, keep them in as close to the armature as possible to prevent fore or aft movement of
the armature, but not so close as to bind and prevent rotation for indexing. Retract or
remove the centers to prevent damage to the armature. Each V-support has a vertical
adjustment of 1" for bearings or shafts of different diameters. One of the centers is spring-
loaded to make mounting of several armatures of the same size easier. The spring loaded
center may be locked in position for heavier work.
Using the operating handle, push the carriage back until the saw is positioned to cut as close
to the riser as desired. Loosen the thumbscrew and set the stop rod to limit the carriage trav-
el.
With the saw at riser end of the commutator, turn the motor on and lower the saw into the
mica strip to the desired cutting depth using the hand wheel (30-30) on the vertical adjust-
ing screw. The arbor is lowered by turning the hand wheel counter-clockwise: (.050 to each
revolution.) (loosen the screw with T-Knob on the motor support before adjusting the vertical
screw, and tighten it after adjustment.)
Start the cut at the back of the commutator and pull the saw toward you at an even rate until
the slot is cut the entire length. At the end of the slot, lift up slightly on the operating handle
to raise the saw up out of the slot, above the level of the commutator and return the saw
arbor back to the riser. Index the commutator to center the saw on the next mica strip, lower
the handle slowly to let the saw enter the mica and pull the saw through this second strip,
etc. Lifting the saw out of the cut when returning the saw arbor back to the riser end for the
next cut lengthens the saw life and reduces the chance for accidental damage to the com-
mutator.
FOR VERTICAL COMMUTATORS:
Mount the armature in the same manner as for the horizontal commutators.
Fasten the end of the operating handle (30-18) to the bottom of the bottom end of the car-

PO Box 430 Cleveland, OH 44107 • Phone [phone] • Fax Local 521-9476 / USA & Canada [phone]
E-Mail: [email protected] • Website: www.martindaleco.com
riage lifting arm (30-15) as explained above under Initial Assembly .
Push the motor carriage toward the commutator until the saw is withing about 1/8" of the face
of the commutator and set the carriage stop with the screw with T-Knob. Adjust the motor
carriage position with the vertical adjustment handwheel (30-30) until the saw is near the
armature shaft end of the commutator. Lock the carriage to the vertical adjusting screw (30-
11) by means of the thumbscrew on the motor support.
Next, with the saw at the top of the commutator, turn the motor on, and, by making small
adjustments on the horizontal carriage stop, feed the saw into the mica strip to the desired
depth and set the horizontal carriage stop at this point. Slowly lower the operating handle
until the saw has cut the full length of the mica strip. A slight pull on the operating handle
will remove the saw from the slot and the operating handle can be raised up until the saw
has cleared the commutator. Index the commutator to line up the saw with the next mica
strip, push the operating handle forward (with the saw still clear of the commutator) and then
lower the saw through this second strip, etc.
MAINTENANCE:
The bearings in the saw spindle housing are lubricated when assembled and do not
require periodic maintenance.
Tracks on which carriage ball bearings travel both vertically and horizontally, should be
kept wiped clean and lightly oiled.
Occasional lubrication of other various points such as the vertical adjusting screw, bearing
etc., is sufficient.
DRIVE BELT TENSIONING:
The spindle drive motor is mounted on 4 studs - (1/4-20 x 1-1/2”). Each of these studs car-
ries 3 nuts and 2 washers. The outermost nuts and washers on each stud are moved in or
out evenly, to tighten or loosen the drive belt tension. When the belt tension is correct the
nuts and washers are securely tightened against the motor.
RETRO FITTING OF THE BELT TENSIONING ADJUSTMENT:
If the machine does not have the belt tensioning adjustment studs fitted, it is simply a mat-
ter of removing the 4 x 1/4-20 cap head screws and replacing them with the 4 x 1/4-20x1-
1/2” studs, locked in place by the single 1/4-20 jam nuts.

PO Box 430 Cleveland, OH 44107 • Phone [phone] • Fax Local 521-9476 / USA & Canada [phone]
E-Mail: [email protected] • Website: www.martindaleco.com
SAWS and CUTTERS — HIGH-SPEED Steel or CARBIDE
Two ball bearing spindles are available, with 1/8” or 3/16” arbors. The machine is equipped
with one spindle only; additional spindle available at extra cost. For undercutting horizontal
commutators only, the 1/8” spindle is recommended; with it, the 1/8” hole saws listed below
are used. When both horizontal and vertical commutators are to be undercut, the 3/16” spin-
dle is used, with the 3/16” hole saws or V-cutters.
SAWS (“U”-Slot)
Saws stocked in these thicknesses:
.015”, .018”, .020”, .023”, .025”, .026”, .028”, .030”, .032”, .035”, .038”,
.040”, .043”, .045”, .050”, .053”, .055”, .058”, .060”, .063”, .065”
(Other thicknesses available at extra cost.)
Type O.D. Hole No. Teeth
9-1/2HS 5/16” 1/8” 16
32-HS 3/8” 1/8” 18
33-HS 3/8” 3/16” 18
12-HS 7/16” 1/8” 18
42-HS 1/2” 1/8” 18
16-HS 1/2” 3/16” 18
13-HS 11/16” 3/16” 28
V-CUTTERS (“V”-Slot)
They are all .045” thick and stocked with 40°, 50°, and 60° angles between cutting
edges. 40° V-cutters are for thin mica, 50° for medium mica, 60° for thick mica.
Type O.D. Hole No. Teeth
42-VHS 1/2” 1/8” 14
17-VHS 1/2” 3/16” 14
13-VHS 11/16” 3/16” 16

PO Box 430 Cleveland, OH 44107 • Phone [phone] • Fax Local 521-9476 / USA & Canada [phone]
E-Mail: [email protected] • Website: www.martindaleco.com
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30-15
30-21
30-18
30-2

PO Box 430 Cleveland, OH 44107 • Phone [phone] • Fax Local 521-9476 / USA & Canada [phone]
E-Mail: [email protected] • Website: www.martindaleco.com
Quantity Description Part No.
Undercutter
1 Base HV3U301
1 Carriage HV3U302
1 Motor Support HV3U303
2 V-Block Support HV3U304
2 V-Block HV3U305
1 Short Center HV3U306
2 Adjusting Knob HV3U307
1 Center Knob HV3U308
1 Spindle (Specify 1/8” or 3/16”) HV3U309 (18 or 316)
1 Spindle Housing HV3U3010
1 Motor Support Adjusting Screw HV3U3011
1 Adjusting Screw Plate HV3U3012
2 Roller Slide HV3U3013
1 Handle Guide HV3U3014
1 Carriage Lifting Arm HV3U3015
1 Rod with Handle HV3U3018
1 Stud for Stop Rod HV3U3019
1 Stop Rod HV3U3020
1 Spacer HV3U3021
1 Washer for Adjusting Screw HV3U3022
1 Roller Rail L HV3U3023L
1 Roller Rail R HV3U3023R
2 Motor Support Guide Rail - Vertical HV3U3024
1 Spindle Screw (specify 1/8” or 3/16” HV3U3025 (18 or 316)
1 Front Shield HV3U3026
1 Rear Shield HV3U3027
1 Belt Guard with Brackets HV3U3028
1 Hand Wheel HV3U3030
1 Motor 115V. or 230V. w/ Cord & Switch HV3U12656 (A or B)
1 Motor Pulley (1-1/2 x 3/8”) HV3UOS17
1 #1170 BELT HV3U1170
4 Motor Spacer
1 Spindle Pulley (2 x 3/8”) HV3UOS22
2 Spindle Bearing (77R6) HV3U77R6
4 Vertical Guide Rail Bearing (77-R-4) HV3U77R4
4 Carriage Bearing (#87008) HV3U87008
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