Sharp AE-X9JJ Manual do Utilizador descarregar pdf (Página 15)

V-SLOT

V-slots keep slots free from dust accumulations at low speeds, and do not require a separate operation for cham-

fering of the bar edges. V-slots are usually made with either a slotting file, or a “V” tooth circular cutter.

Usual practice is to use a circular cutter having an included angle between cutting edges such that a cut made 1/16

inch deep will also leave 1/32 inch free copper above the mica. The “V” tooth circular cutter are available with 40°,

50° or 60° angles between the cutting edges.

U-SLOT

The U-slot (as shown in Fig. 1) is generally preferred if the slots are accessible for easy cleaning. These slots have

the advantage, if done carefully, of being effective until the commutator has worn down the full depth of the undercut.

The slot should be cut to a depth of 1/32 (.032) inch, or not more than 3/64 (.046) inch. If cut too deep, accumulated

dust will not be thrown out by the centrifugal action of the rotating commutator.

When using a circular cutter, the width of the cutter is chosen to exceed slightly the thickness of the mica. It is rec-

ommended that the SAW THICKNESS be figured on the basis of the mica thickness plus .003” (.08mm). This will

allow the saw to remove the full width of the mica pus .0015” (.04mm) of copper on each side of the mica slot. If

unable to determine the mica width, the use of a feeler gauge can best determine the required saw thickness.

Consequently, some copper is cut or dragged off the bar during undercutting, (as shown in Fig. 2).

In addition to leaving a jagged edge projecting from the commutator bar, the edge of the bar becomes somewhat

work-hardened and hence will not wear down uniformly. Therefore, the edges of the bars must be chamfered by using

a suitable slotting file or a specialty shaped scraper. ** See Martindale slotting scrapers. **

A chamfered face of approximately 1/64 inch is usually adequate to remove any roughness or edge hardening that

could be disturbing to the brush faces.

MARTINDALE

• 1375 Hird Ave • Cleveland, OH 44107

Phone (216) 521-8567 • Fax Local 521-9476 / USA & Canada (800) 344-9191

E-Mail: [email protected]

Web Site: www.martindaleco.com

11/07

Continued Next Page

Helpful Hints For Saw Users

(Mica Undercutting Saws & V-Cutters) (Continued)

Fig. 1

Fig. 2

Type “U” Slot

Type “V” Slot

Saw Cut

Copper

Saw Cut

Copper

Mica

Rough Edge Caused

by Undercutting

Bevel to Remove

Rough Edge

Slotting Off Center

Leaves Mica Fins

1 2 ... 10 11 12 13 14 15 16

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