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Old 10th February 2011, 21:35   #46
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Default Re: A Winch Test

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^^^^Why?
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Hmm , why it sounds like Arka
Hi Sudarshan JEE,

2 Bearings, is is Full-Floating

Regards,

Arka
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Old 10th February 2011, 21:39   #47
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Default Re: A Winch Test

^^^

yes , but no Engineering involved ,just cooked everything in thoughts & implemented

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Old 10th February 2011, 22:00   #48
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Default Re: A Winch Test

Hi,
6205 static load limit ~ 7KN. 2 bearings -> 14 KN.
10K lbs winch.
Force on snatch block = double that on winch.

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Sutripta
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Old 11th February 2011, 12:40   #49
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Default Re: A Winch Test

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Originally Posted by Tejas@perioimpl View Post
Can you explain with a diagram how you would connect 2 blocks?
here it is ,have a look

A Winch Test-warnlinepull.jpg


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Originally Posted by Sutripta View Post
BTW, I can't get an idea of the size. What bearings have you used? 6205? zz or 2rs?

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@
but what I remember is the smaller pulley uses 2 No.'s of yezdi wheel bearings ( 6203 ? ) & larger uses the 800's wheel bearings ( may be 6205 )
these are single side rubber sealed ( 1 RZ ? )

Correction : small pulley bearing size 6302 , 2RS1
: large pulley bearing size 6204 , 2RS1

Pics of pulleys with scale

A Winch Test-winchpulley1.jpg

A Winch Test-winchpulley2.jpg

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Originally Posted by Sutripta View Post
Hi,
6205 static load limit ~ 7KN. 2 bearings -> 14 KN.
10K lbs winch.
Force on snatch block = double that on winch.
SKF ratings (Load ) for single bearing :

1) 6302 , dynamic 11400 , static 5400 ( N )

2) 6204, dynamic 12700 , static 6550 ( N )

will this be sufficient ?

Sudarshan

Last edited by Sudarshan : 11th February 2011 at 12:46.
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Old 11th February 2011, 21:10   #50
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Default Re: A Winch Test

^^^^
Tough question.

Will it fail in service? No, don't think so. Though under worst case conditions, the bearing will 'flat spot' and become 'coggy'. If and when that happens, just replace it with a bush. The worst case loadings are way beyond design specs.

Seeing the pictures, I'd be more worried about the bolts (axles) used.

Why two different sizes?

OT. At what line pull will your vehicle start skidding across the tarmac with all four wheels locked?

Regards
Sutripta
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Old 11th February 2011, 21:29   #51
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Default Re: A Winch Test

^^^
the axle pins/bolts are 15 mm & 20 mm , don't think they will shear

Hmm , two sizes for pulleys ?, got different dia material ( from scrap )

& the vehicle skidding on tarmac ( while winching & wheels locked ) -- well , never tried it but looks tough . My landy weighs 2.2 tons ( with all equipment & gear ) & the winch is 10,000 pounds ( Warn ), will never know unless tried .

but why you suggest that ?

I think it will need a double line pull with some two layers on drum .

BTW can you explain the bearing static load rating in relation to the pulleys in lay mans language ? ( went overhead actually )

Sudarshan

Last edited by Sudarshan : 11th February 2011 at 21:32.
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Old 11th February 2011, 22:12   #52
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Default Re: A Winch Test

^^^^
Hi,
Ball bearings are not good for heavy static loads. The area of contact of the ball with the race is very small, and if a constant high load is applied for any length of time, will deform. Hence the (rather low) static load limit.

Back of envelope calculation:-
10,000 lbs line pull ~ 4500 Kg. (Assuming that's how this winch is rated. Not as 'suitable for vehicle weighing till 10,000 lbs')
Force on snatch block = 9000 Kgf ~ 90,000N
To be shared by two bearings.

Maybe one should get down to testing these snatch blocks (and pintle hooks and shakles and cables/ chains and ...) on an UTM. Maybe buying these from a crane/ hoist supplier (where these have to be tested and certified) would not be a bad idea.

My concern with the bolt is with the quality, not diameter. The thread seems to have worn out badly, indicating soft material.

With a monster winch, was trying to figure out what pull you could exert (recovering another vehicle) without being tethered down yourself.

Regards
Sutripta
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Old 7th March 2011, 22:38   #53
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Talking Re: A Winch Test

Continued from my post # 34

Update : I was searching for a Battery disconnect switch & I found one .It is used mainly in Petroleum Tankers ( trucks ) to disconnect the battery fully , as they load & unload .( I have heard its mandatory for them by RTO & also by filling depots ) I have seen these used in ST buses also .

Now for me the Question is do I fit it for each battery or at common junction . anyways I am going to fit it at /on negative/earth wire .

have a look

A Winch Test-switch1.jpg

Sudarshan
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Old 7th March 2011, 23:17   #54
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Default Re: A Winch Test

my simple advice - change the 3 wires that connect between the positive terminal of battery to alternator, negative terminal of battery to chassis, earthing from engine to chassis. doing this solves any leakage in the electrical system.
the cutoff switch you have given is used in all heavy vehicles, to prevent battery drain or unwanted earthing problems, pls connect this to the negative to chassis ground.
Best Regards.
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Old 8th March 2011, 18:21   #55
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Default Re: A Winch Test

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my simple advice - change the 3 wires that connect between the positive terminal of battery to alternator, negative terminal of battery to chassis, earthing from engine to chassis. doing this solves any leakage in the electrical system.
I could not understand this , will you please give some more details as to what needs to be done ?

IMHO, if every component is working properly ( starter,alternator, switches etc) then there is no chance of leakage .

I want a disconnect switch as an additional measure of safety-&- to disconnect quickly. ( while repairing , unattended parking , accidental damage to components,short circuits etc )

here is the diagram of the dual battery circuit I have created on my Landy

for me, now the question is to whether I fit two switches at each battery ( negative terminal ) or a single switch at point no 2. have a look .

A Winch Test-bhpsend1.png

Sudarshan
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Old 8th March 2011, 19:05   #56
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Default Re: A Winch Test

Dear Sudarshan,

Using quick disconnect wire will actually solve the problem, & secondly it is alway help full & avoid any body misusing the winch,

best regards
vinay thomas
--------------------------------------------------------------------

Quote:
Originally Posted by Sudarshan View Post
I could not understand this , will you please give some more details as to what needs to be done ?

IMHO, if every component is working properly ( starter,alternator, switches etc) then there is no chance of leakage .

I want a disconnect switch as an additional measure of safety-&- to disconnect quickly. ( while repairing , unattended parking , accidental damage to components,short circuits etc )

here is the diagram of the dual battery circuit I have created on my Landy

for me, now the question is to whether I fit two switches at each battery ( negative terminal ) or a single switch at point no 2. have a look .

Attachment 514031

Sudarshan
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Old 8th March 2011, 20:11   #57
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Default Re: A Winch Test

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secondly it is always help full & avoid any body misusing the winch,
check this link : its already taken care of .

http://www.team-bhp.com/forum/4x4-ve...family-76.html (Mahindra CJ340 joins Team-BHP family)

see posts # 1129 & 1131

Sudarshan
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Old 16th March 2011, 20:57   #58
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Default Re: A Winch Test

Just use the one swicth at the point both the battery terminals join,why use two?

why are you planning to use the switch on the negative terminal??
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Old 16th March 2011, 22:03   #59
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Default Re: A Winch Test

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Originally Posted by motocamp View Post
Just use the one swicth at the point both the battery terminals join,why use two?
that's what I am thinking too.

Quote:
why are you planning to use the switch on the negative terminal??
you must be kidding , say you don't know that

OK but for readers , the circuit will be 'dead' in a quick flick of the switch .Also there is less load on negative wire ( always ), compared to positive , so its good for the switch life ( IMHO & AFAIK )

Suppose there is a short circuit , then you only disconnect the negative , that's the only 'Safe 'first step ' ( AFAIK & IMHO )

but if anyone wants to fit it on positive it should be as close as possible to the battery terminal , so that if the main wire gets short ( open ) then only it will work properly. ( but more serious trouble can occur ,positives get too hot too quickly & so will be the switch , you may not be able to touch it ) am I right here ? experts ?

Sudarshan

Last edited by Sudarshan : 16th March 2011 at 22:06.
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Old 30th June 2011, 21:34   #60
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Default Re: A Winch Test

update

fitted the battery disconnect switch , refer to post # 55 drawing , this is fitted at the negative common conductor --- between the two battery earth wire & the two earth wires which go to winch & starter ( engine / chassis )

A Winch Test-dscn2620.jpg


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