Heavy duty polar mount prototype 1

Huevos said:
Sigh. If I got a lorry and put a lorry wheel on one end of the axle and a bicycle wheel on the other end the load bearing capacity before failure would only be as strong as the bicycle wheel. That is because they are on opposite ends of the shaft.

Also I think you need to look up the difference between static and dynamic load, because it certainly doesn't translate into radial and axial.
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Huevos , i think you mix-up radial and axial . Its hard to find the right words in Englisch for me , so i surched for this on Wiki .

Direction of load[edit]
Most bearings are meant for supporting loads perpendicular to axle ("radial loads"). Whether they can also bear axial loads, and if so, how much, depends on the type of bearing. Thrust bearings (commonly found on lazy susans) are specifically designed for axial loads.[8]

For single-row deep-groove ball bearings, SKF's documentation says that maximum axial load is circa 50% of maximum radial load, but it also says that "light" and/or "small" bearings can take axial loads that are 25% of maximum radial load.[8]

For single-row edge-contact ball bearings, axial load can be circa 2 times max radial load, and for cone-bearings maximum axial load is between 1 and 2 times maximum radial load.[8]

Often Conrad style ball bearings will exhibit contact ellipse truncation under axial load. What that means is that either the ID of the outer ring is large enough, or the OD of the inner ring is small enough, so as to reduce the area of contact between the balls and raceway. When this is the case, it can significantly increase the stresses in the bearing, often invalidating general rules of thumb regarding relationships between radial and axial load capacity. With construction types other than Conrad, one can further decrease the outer ring ID and increase the inner ring OD to guard against this.

If both axial and radial loads are present, they can be added vectorially, to result in total load on bearing, which in combination with nominal maximum load can be used to predict lifespan.[8] However, in order to correctly predict the rating life of ball bearings the ISO/TS 16281 should be used with the help of a calculation software.
 
That is what we call a taper bearing. Not generally strong enough to be used on front wheel drive cars( unless a spacer is used in between both bearings). Commonly found in rear brake drums VW, Vauxhall etc etc.....yawn
 
Piltdownpaul said:
That is what we call a taper bearing. Not generally strong enough to be used on front wheel drive cars( unless a spacer is used in between both bearings). Commonly found in rear brake drums VW, Vauxhall etc etc.....yawn
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And within virtually all motorcycle front end steering yokes using traditional forks.

 
Channel Hopper said:
Got a fix for that
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I was just trying to make it clear which are radial and which are axial loads. Obviously whatever bearings are used they will need to bear both forces.
 
Martin... how is it going? Any updates on the PM?

Congrats on the "staff member" promotion. Hope you're getting some compensation ;)
 
Captain Jack said:
Martin... how is it going? Any updates on the PM?

Congrats on the "staff member" promotion. Hope you're getting some compensation ;)
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Thank you CJ. no updates to mention ATM but I will be getting back on with it next week, I will report when works starts again:).
 
Hi, I will be resuming work on this tomorrow, I've been struggling cutting the steel straight with the angle grinder and was not happy with the results,

After a few weeks of looking for a cheap cut off saw, I have managed to locate and picked up a second hand one today :).
DSCN5774.webp
 
Nice one. Hope you have a 110v transformer.
Looking forward to the updates. Hope it goes well.
 
..to cheer you up :) The backplane of my Echostar 120cm is similar to CM. Other than replacing some bolts and nuts (and of course the LNB) it's still in its original state since 20 years, including the actuator (Arkivator with optocoupler). Though it needs some cleaning ;)
 

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Has Martin posted recently ?
I just hope he hasn't lost a hand or somesuch to that beast of a cutter he bought ....
Give us a hoy Martin
 
@ Martin, i'm at a point with my 1.8 CM mount where i need to make some final decisions re: my main bearings. Iv'e got a pair each of these in the pic that i could possibly make use of, the A4 pivot bolt with the oilite bush is 20mm , the 4bolt bearing is M18 bore ..... what did you decide on for yours in the end chap
 
John said:
@ Martin, i'm at a point with my 1.8 CM mount where i need to make some final decisions re: my main bearings. Iv'e got a pair each of these in the pic that i could possibly make use of, the A4 pivot bolt with the oilite bush is 20mm , the 4bolt bearing is M18 bore ..... what did you decide on for yours in the end chap
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Hi john, mines not finished yet, but I will be doing something like this below on the polar mount one.
https://www.satellites.co.uk/forums...stallation-and-plan.163449/page-8#post-915387

SDC10383.webp Under the hood 003.webp
 
martin-f said:
I want the dish on a 4.5 inch pole rima for stability so making another pole mount I will be in the same boat, the dish will have two jacks on it so if its a little out it does not matter I can move it in to line,

I have had a good think of what I am doing not just gone out and started work on this project a lot of thought has gone in to it;)
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Respect to you with thinking .......¿ R u taking orders yet? :D:D
 
lovelyperson said:
Respect to you with thinking .......¿ R u taking orders yet? :D:D
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Thanks LP, I have too much on to get round to doing my own atm pal :(, once the 1.8 is up and running I will be making an EZ/AL mount for it once that's up and running, I will give you the first refusal on the P/M and alter it to your needs :)
 
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