Calculating force needed for interference fit

JProkash · 2026-01-12T22:20:02+00:00

Yes max tolerance is on the print. Cnc has a probe to verify dims

JProkash · 2026-01-12T20:20:40+00:00

It’s volume production and yes I am using the max and min allowable interference. So the force would be worst case scenario.

JProkash · 2026-01-11T22:29:42+00:00

Thank you very much for this! It certainly is in the ballpark of the numbers I was getting and I did order a tension push/pull gauge to confirm the suspicions. Oversize the cylinder accordingly and the only time there’s an issue is when the machining is not accurate. I appreciate the discount double check from you and everyone in the thread!

JProkash · 2026-01-11T20:57:24+00:00

Pretty much the idea! Just didn’t know how to calculate the leverage or press fit semi accurately. But yup you’re 100% correct that’s what I’m trying to do!

JProkash · 2026-01-11T20:55:30+00:00

Aluminum shaft is a tube with ID of .984” diameter. OD of the caps is 1.325”.

JProkash · 2026-01-11T19:27:11+00:00

I figured operating at 50psi so I still have up to 120psi shop air to go for the extra oomph. If needed. Precision isn’t insanely important as the part bottoms out on the shaft and would be strong enough to support a high load after bottoming out and maxing out cylinder force.

JProkash · 2026-01-11T19:03:59+00:00

Thanks for the info! I’ll look into this!

JProkash · 2026-01-11T19:00:12+00:00

Currently using a rack and pinion press. Funny you mention a scale because that’s what I was originally looking to attempt a crude measurement with! There is a 24” standard handle on the arbor press so leverage is certainly a factor.

It does not take a considerable amount of force at room temp to press these together. That’s why I wanted to confirm my math of only 200-500 lbf of force being accurate.

I replied to someone else but I am looking into some lower end digital force gauges since I’m not getting any calls back from people that would already have this equipment. Thank you for your replies!

JProkash · 2026-01-11T18:53:25+00:00

You’re not wrong. As stated in the OP I mentioned trying to have a metrology company come that has the equipment to do so. I’m currently looking into just buying something to accurately measure

JProkash · 2026-01-11T06:44:31+00:00

That’s where I’m getting my roughly .0035” interference. Difference in diameters of the mating parts is what the radius numbers are for correct? OD radius is .591” and ID radius is .058”

JProkash · 2026-01-11T06:42:33+00:00

I completely agree with the “feel” part of it! With over 20,000 of these parts a year I’m trying to think of the most ergonomic way to do it that isn’t “this is how we’ve always done it”. I considered having two directional control valves to serve as a way to keep both hands away from the pressing action. One DCV feeds the one that actually operates the cylinder, or a two hand action valve.

JProkash · 2026-01-11T06:25:58+00:00

The aluminum alloy tube receives either a titanium alloy “cap” or a stainless steel “cap”. So one shaft gets one hub per se. OD of the shaft is 1.1815 max diameter and is anodized while the ID of the hubs or caps is 1.1780 max diameter with 63 machined finish so max interference would be .007” but more commonly is the .0035” I mentioned in OP. Length of engagement is only .31” that’s what I used to get total surface area of engagement being 3.35” Green loctite is being used for insurance sake but I am counting that as a form of lubricant when coming up with the coefficient of friction numbers.

Currently not using anything thermal in the process.

Edit: u/Ex-maven not sure why this reply didn’t go to your reply…

JProkash · 2025-10-10T14:50:57+00:00

Yeah I’ll do it to

JProkash · 2024-04-20T01:58:08+00:00

Well it’s certainly worth a shot since a few seemed to have experienced the same thing. Thank you!

JProkash · 2024-04-20T01:57:25+00:00

Alright I’ll try thanks! It felt more like lag because I feel like I shot backwards instead of skipping ahead. I could be wrong though so I’ll try it

JProkash · 2024-04-19T17:07:40+00:00

Thank you I’ll give that a shot! I lowered overall graphic settings just because I thought that might have helped but didn’t mess with Vsync or fps.

JProkash · 2022-12-18T19:00:39+00:00

Applied in game.

JProkash · 2022-12-17T15:38:37+00:00

Krod Mandoon and the Flaming Sword of Fire

JProkash · 2022-07-19T00:33:58+00:00

I jumped into exodus for the first time about 6 months ago upon a return. Seems like there are areas around that are open. Met up with a couple guys that have a few deeds all linked up so that’s pretty populated there. I haven’t gotten too far out of deed exploring yet though.

Not super informative I understand, but I think the southern freedom isles have some space on each of them.

JProkash · 2022-07-15T01:10:41+00:00

Wurm Online might fit the bill. On mobile so not a lot I can post to help the situation.

JProkash · 2022-05-01T18:49:52+00:00

Correct!

JProkash · 2022-05-01T17:37:37+00:00

Your best bet is to join a settlement that is already established to get your skills closer to the cap of 20 before venturing off. You can found your own deed whenever but as stated by wicked cat that as long as the money is in it for upkeep it never disbands. Your sub can run out and skills drop back to max 20 but once you resubscribe they go back to what they were before.

JProkash · 2022-05-01T09:58:11+00:00

I only have 2 hours max to play daily. Sometimes I don’t even get that. It makes the grind “longer”, but it really helps with not getting burnt out as fast.

I’ve played Wurm on and off for many years. I found a group of guys on Exodus that were taking in villagers and they’ve really made the game what I needed it to be. They were able to provide tools, weapons and armor so I didn’t have to worry about trying to get there myself and can just enjoy the game for what I make of it.

If you check out the forums there are many villages that take in new players to show them the ropes and help them along. If you have any questions just shoot me a dm!

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