TM 9-4910-683-14&P
TROUBLESHOOTING
a.
Problem: Drum or disc chatter.
Reason:
- Wrong adapters.
- Dull Tool Bit.
- Failure to use drum Silencing Band SB-10 or disc Dampener Assembly (151).
- Improper use of drum Silencing Band SB-10.
- Incorrect spindle speed.
- Areas to be checked for tightness.
(1)
Tool Bit.
(2)
Tool Bit Holders (132 & 133).
(3)
Boring Bar (146).
Cross Slide Gib (103). To adjust, see Paragraph l - 7 8 b .
(4)
Apron Gib (94). To adjust, see Paragraph 1 - 7 8 a .
(5)
Arbor.
(6)
Arbor Nut.
(7)
(8)
Tool Plate (128).
Cross Slide Thumb Screw (100), when machining drums.
(9)
(10) Apron Thumb Screw (101) when machining discs.
(11) Drum to hub mounting.
(12) Excessive spindle to bearing clearance (sideplay).
(13) Spindle end play.
Problem: Arbor runout (wobble).
b.
Reason:
- Without mounted drum.
Dirt between arbor taper and Spindle (8) taper.
(1)
(2)
Bent arbor.
- With mounted drum.
Dirt between adapter and bearing cup.
(1)
(2)
Dirt or burr between faceplate and drum.
(3)
Dirt between spacer and adapter.
(4)
Bearing cups not seated in hub.
c.
P r o b l e m : Cross Slide Screw (106) binding.
Reason:
- Dovetail ways dirty.
- End Plate (112) misalined.
- Needs lubrication.
d.
Problem: Machines drum eccentrically.
Reason:
- Drum mounted improperly.
- Bent hub or drum.
- Wrong adapters being used.
- Defective adapter.
e.
P r o b l e m : Arbor cannot be tightened into Spindle (8).
Reason:
- Threads dirty.
- Threads damaged.