R&M Materials Handling WIRE ROPE HOISTS Service - Manual (Page 60)

R&M Materials Handling, Inc.
4501 Gateway Boulevard
Springfield, Ohio 45502
P.: (937) 328-5100
FAX: (937) 325-5319
60/130
R&M Materials Handling, Inc. reserves the right to alter or amend the above information without notice.
D2 = Drum groove top
diameter
242 mm 301,8 mm 353 mm 403,2 mm 404 mm 604,2 mm 605,2 mm 604,2 mm
D3 = Drum nominal
diameter
243 mm 303 mm 355 mm 406 mm 406 mm 608 mm 608 mm 608 mm
P = Groove pitch 7,0 mm 7,2 mm 9,1 mm 12,5 mm 9,1 mm 17,1 mm 12,5 mm 17,1 mm
G = Groove depth 2,75 mm 2,4 mm 3,0 mm 4,1 mm 3,0 mm 5,6 mm 4,1 mm 5,6 mm
Drum groove
circumference =
Π x D1
743 mm 933 mm 1090 mm 1241 mm 1250 mm 1863 mm 1876 mm 1863 mm
Acceptance criteria
C = Circumference
change, 0.4% of nominal
< 3,0 mm < 3,7 mm < 4,3 mm < 5,0 mm < 5,0 mm < 7,4 mm < 7,4 mm < 7,4 mm
Groove depth change,
20% of nominal
< 0,6 mm < 0,5 mm < 0,6 mm < 0,8 mm < 0,6 mm < 1,1 mm < 0,8 mm < 1,1 mm
Tools needed: caliper, tape ruler, square ruler, ruler (or flat bar), thin steel wire (piano wire or 0,8 .. 1,0
mm thickness welding wire).
First measure reference circumference and groove depth on a drum area, which is not worn (= rope does
not usually come out of the drum). Then do the same measures in at least 3 points on the drum where
grooves are most worn.
Drum circumference
• Place min. 55 mm long ruler (R) or flat bar on the top of 3 grooves on the rope drum unworn area.
Make sure by square ruler that the ruler is perpendicular to the grooves.
• Turn piano wire (W) one round around the rope drum on the bottom of the groove. Mark start and end
points (M) on the wire by help of the ruler.
• Then mark the acceptance criteria (A) in the wire, to distance C mm from the end mark. When
measuring worn grooves, compare the drum circumference to this mark. The maximum allowed
difference in circumference between reference area and worn area is 0.4%.
Groove depth
• Place min. 55 mm long ruler or flat bar on the top of 3 grooves (1) on the rope drum unworn area
• Measure groove depth (G) placing caliper on the ruler.
• Repeat same measurement on the worn area of the drum.