Servicing projection equipment (1932)

Page scan 000102 from Servicing projection equipment

Record Details:

Title:
Servicing projection equipment
Date:
1932
Publisher:
New York : Mancall Publishing Corp.
Volume:
Servicing projection equipment
Leaf #:
000102
Language:
English
Subjects:
Motion Pictures, Motion Picture Technology
Collection:
Books
Format:
Books
Contributor:
Media History Digital Library
Sponsor:
Media History Digital Library
Coordinator:
Media History Digital Library
Description:
Date Added:
August 15, 2024
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86 COMMUTATOR TROUBLES probably contain grit. Use only brushes which are of the best grade. (c) — There may be no "float" to the armature, therefore be sure that it has a trifle of end play. 4. Commutator is Cut and Rough (a) — This may be due to too much brush tension. This condition should be corrected if found. (b) — Dirty brush faces and cheap brushes will also cause this trouble. Clean them or change their quality. (c) — The lack of armature "float" or end play is another reason for this trouble. This can be corrected by leveling the set. (d) — The brushes may be off their correct setting. Eeadjust them according to the markings. (e) — The brushes are jammed in the holders thereby causing a metallic brush scraping. (f ) — The brushes are worn down and are too short, causing the metal of the spring or other pressure device to make contact with the commutator. The brushes should be replaced more often. (g) — This trouble may also be due to hard brushes which have a gritty surface or to a piece of metal between the brush face and the commutator.