- #1
hummina
- 6
- 0
A skateboard axle is 8mm thick and typically 4140 steel. Can I make up for its hardness or other strength values with 1144 or even 1018 if I use a 20mm axle?
Making up for hardness and strength with size
In Summary, based on the information provided, it can be assumed that a 20mm axle will be able to handle the load of a skateboard with an 1144 shaft and 1018 rotor, assuming the increased surface area and volume will be stronger.
- #2
berkeman
Mentor
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- 19,863
Welcome to the PF.hummina said:
Can you show us what you are trying to do? What kind of board are you working on? Standard, long board, Carver, etc.?
Why do you want to change to a thicker axle?
- #3
hummina
- 6
- 0
Steelhubs.com you can see pictures. Electric skateboard hub motors.
Using Those three three metals I just made assumptions and generalizations based on the shafts and housings being larger surface area and more mass than a standard 8mm skate axle
. I'll post the different number sheets of those materials to make it easier to see what we are comparing. I'm more than curious. If ur interested in motor.. Huge deals for forum help.
I ran the 6000 aluminum center motors many miles and had no mechanical deterioration but really not many miles testing has gone into them and jumped to a steel center as with the thermal expansion and screw-and-glue mounting, ..
What do you think of the 1144 center and 1018 rotor? The smaller bearing sits on a 20x7mm shaft and the housing is 32x7 i think but I'll check
.4mm air gap.
Using Those three three metals I just made assumptions and generalizations based on the shafts and housings being larger surface area and more mass than a standard 8mm skate axle
. I'll post the different number sheets of those materials to make it easier to see what we are comparing. I'm more than curious. If ur interested in motor.. Huge deals for forum help.
I ran the 6000 aluminum center motors many miles and had no mechanical deterioration but really not many miles testing has gone into them and jumped to a steel center as with the thermal expansion and screw-and-glue mounting, ..
What do you think of the 1144 center and 1018 rotor? The smaller bearing sits on a 20x7mm shaft and the housing is 32x7 i think but I'll check
.4mm air gap.
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- #4
JBA
Science Advisor
Gold Member
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Abusive impact loading on the wheel assemblies might be a problem for a lower yield 1018 material
- #5
hummina
- 6
- 0
Yea. The only part wanted to be 1018 would be the bearing housings and they're minimum 32mm x 7mm. A lot of surface.
Cant I figure the load Ability of the steel based on the size? Relate it to the 8mm skate axle?
Cant I figure the load Ability of the steel based on the size? Relate it to the 8mm skate axle?
- #6
hummina
- 6
- 0
Isn't there a formula for figuring the load ability of a shaft based on its mass or surface area and material?
- #7
Nidum
Science Advisor
Gold Member
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hummina said:
There are certainly ways of working out the load carrying capacities of shafts . Draw out your assembly accurately and let us see the drawing .
- #8
hummina
- 6
- 0
Cutting and pasting my drawings isn't working but please check the website steelhubs.com because it's pretty revealing. If you can tell me how to get it up I will.
the smaller bearings in all those motors on that site are old news, I never sold them for that very high price either. They run fine. The new motor is longer and instead of the smaller bearing it's a 20x32x7 and the bigger is 40x52x7
I have been adding high heat retaining fluid on all the slide fittings as I imagined it would better preserve things and to also kept it quieter it's appreciated). I wanted to do an interference shrink fitting but now think it's better to leave it all slide fitted and easily serviceable. But can an 1144 shaft and 1018 cold rolled housing handle it? My no-math answer was yes assuming the increased surface area and volume will be stronger but it's all assumptions based on day to day logic.
http://www.azom.com/article.aspx?ArticleID=6595
Sorry this iPad erases everything when I skip to other pages looking for links but this is one of the steels and the other two and their numbers should pop up. I feel hardness or maybe other or all specifications of a material can be simply multiplied by...or divided by..a diameter or surface area or something, maybe throw some pi in mix it up and poof engineering. ?
the smaller bearings in all those motors on that site are old news, I never sold them for that very high price either. They run fine. The new motor is longer and instead of the smaller bearing it's a 20x32x7 and the bigger is 40x52x7
I have been adding high heat retaining fluid on all the slide fittings as I imagined it would better preserve things and to also kept it quieter it's appreciated). I wanted to do an interference shrink fitting but now think it's better to leave it all slide fitted and easily serviceable. But can an 1144 shaft and 1018 cold rolled housing handle it? My no-math answer was yes assuming the increased surface area and volume will be stronger but it's all assumptions based on day to day logic.
http://www.azom.com/article.aspx?ArticleID=6595
Sorry this iPad erases everything when I skip to other pages looking for links but this is one of the steels and the other two and their numbers should pop up. I feel hardness or maybe other or all specifications of a material can be simply multiplied by...or divided by..a diameter or surface area or something, maybe throw some pi in mix it up and poof engineering. ?
- #9
hummina
- 6
- 0
no one knows?
1. What does "making up for hardness and strength with size" mean?
"Making up for hardness and strength with size" refers to the concept of compensating for lower levels of hardness and strength in a material by increasing its size or volume. This is often done in engineering and materials science to achieve the desired properties in a material without having to use a more expensive or difficult-to-obtain material.
2. How does size affect the hardness and strength of a material?
The size of a material can affect its hardness and strength in several ways. First, as the size of a material increases, its surface area to volume ratio decreases, which can lead to decreased surface defects and increased overall strength. Additionally, larger materials can also have a greater number of internal grain boundaries, which can also contribute to increased strength. However, there are also cases where larger materials may have more defects or flaws, which can decrease their strength.
3. What types of materials benefit from "making up for hardness and strength with size"?
This concept is commonly used in metals and alloys, but can also apply to other materials such as ceramics and polymers. It is often used in situations where a material needs to withstand high levels of stress or wear, such as in construction or manufacturing equipment.
4. Are there any drawbacks to using this approach?
While increasing the size of a material can have benefits in terms of hardness and strength, it can also come with some drawbacks. For example, larger materials can be more difficult to shape and process, and may require specialized equipment. Additionally, increasing the size of a material may also increase its weight and cost.
5. Can "making up for hardness and strength with size" be used in all situations?
No, this approach may not be suitable for all situations. In some cases, increasing the size of a material may not have a significant impact on its hardness and strength, and other methods may need to be used to improve these properties. Additionally, there may be limitations on how large a material can be made while still maintaining its desired properties.
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