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Old 08-29-2010, 08:16 AM
donse donse is offline
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Default rotorhead bearing

what type of bearing is used with the benson offset gimble head.i've seen the part#5602 but i dont know if its a ball or roller type bearing. thanks Don
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Old 08-29-2010, 08:45 AM
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gyrojake gyrojake is offline
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Originally Posted by donse View Post
what type of bearing is used with the benson offset gimble head.i've seen the part#5602 but i dont know if its a ball or roller type bearing. thanks Don
Here is a link--By the way it's a 5206

http://www.thebigbearingstore.com/servlet/Categories

get 5206-2rs. I don't recomend the chinese bearing, get an SKF they don't list it but they sell it.

~~JAKE~~
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Old 08-29-2010, 08:52 AM
donse donse is offline
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Thanks Jake
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Old 08-29-2010, 09:01 AM
Alan_Cheatham Alan_Cheatham is offline
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MRC 5206 Dual Row Angular Contact double seals

http://www.amazon.com/MRC-5206CZZ-An.../dp/B000MNFBHM
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Old 08-29-2010, 10:04 AM
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gyrojake gyrojake is offline
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MRC 5206 Dual Row Angular Contact double seals

http://www.amazon.com/MRC-5206CZZ-An.../dp/B000MNFBHM
This is the same bearing I use--- very good bearing. Cheaper at the link I gave you, I think it was 48 bucks.
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Last edited by gyrojake; 07-25-2012 at 11:00 AM.
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Old 08-29-2010, 01:35 PM
Alan_Cheatham Alan_Cheatham is offline
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Ok, here we go.

For MRC number 5206CZZ the C=non loading slot bearing and an M=max bearing with extra balls and loading slot (which must face DOWN in the rotor head bearing block). ZZ=double rubber seals (MRC is weird here for using Z to indicate rubber seal, most others use RS).

Note now that SKF owns MRC and so bearings may carry both numbers.

SKF equivalent number is 3206A2RS1 the A=non loading slot bearing and an E=max bearing with extra balls and loading slot (which must face down). 2RS1=double rubber seals.

Which is the best bearing to use, max or not? For a light single place gyro the standard bearing with no loading slot is fine and safer if you are unsure of which way to put the bearing into the head. But max bearing would, in my opinion, be best and has been standard on many manufactured ships in the past, just be aware of which way to put the bearing in (loading slot down).


If anyone sees anything wrong with the above information please post a correction.


SKF bearing markings..........

A No filling slots
CB Controlled axial internal clearance
C2 Axial internal clearance smaller than Normal
C3 Axial internal clearance greater than Normal
D Two-piece inner ring
E Max type bearing, with filling slot
HT51 High temperature grease for operating temperature s in the range –30 to +140 C
J1 Pressed snap-type steel cage, ball centered
M Machined window-type brass cage, ball centered
MA Pronged machined brass cage, outer ring centered
MT33 Grease with lithium thickener of consistency 3 to the NLGI Scale for a temperature range –30 to +120 C (normal fill grade)
N Snap ring groove in the outer ring
NR Snap ring groove in the outer ring with snap ring
P5 Dimensional and running accuracy in accordance with ISO tolerance class 5
P6 Dimensional and running accuracy in accordance with ISO tolerance class 6
P62 P6 + C2
P63 P6 + C3
TN9 Injection moulded snap-type cage of glass fibre reinforced polyamide 66, ball centered
2RS1 Sheet steel reinforced contact seal of acrylonitrile-butadiene rubber (NBR) on both sides of the bearing
W64 Solid Oil filling
2Z Shield of pressed sheet steel on both sides of


.
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Old 08-29-2010, 04:10 PM
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This bearing is not bidirectional 5206E2RS. The loading slot must face down and is marked with a blue die on the inner race. You can buy a bidirectional and it would not matter how it was insalled. That would be the 5206A2RS

JAKE
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Old 08-29-2010, 07:02 PM
donse donse is offline
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Thanks for all the info. Don
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