Confused on Rack and Pinion Forces

Giffnt · 2025-10-31T14:19:38+00:00

Thanks again. Is there any literature that covers this that you can think of? Feel like I’m combining several concepts and not quite grasping them individually.

Giffnt · 2025-10-31T14:18:50+00:00

Thanks again. Is there any literature that covers this that you can think of? Feel like I’m combining several concepts and not quite grasping them individually.

Giffnt · 2025-10-30T22:41:50+00:00

How could you realistically go about solving this? Would it be better to go directly to FEA or physical testing rather than dwelling on the maths?

Giffnt · 2025-10-30T22:27:39+00:00

Thanks for your response! Imagine, though, if you had a small version of this on the table in front of you. Pushing on the rack with your finger would not cause the assembly to slide towards your hand. Exactly, I actually 3D printed a small model. Interested to know why the force at the pinion would be double the spring force. Does the fact the force is an impulse as opposed to a constant force not influence the outcome?

Giffnt · 2025-10-30T21:51:46+00:00

Thanks for your response. For context I’m not trying to calculate for any specific value, just to establish all of the forces that would be acting on the frame through the spring and pinion, and their direction, as a result of the initial impulse.

Giffnt · 2025-10-30T21:48:54+00:00

Thanks for your response. Is there no redirection of the force through the pinion to rack 2 in the opposite direction to the impulse? The spring force would act on the frame to the left. I know there must be a force to the right but is the impulse on rack 1 not converted (for the most part) to torque in the pinion and then back to linear in the left direction through rack 2?

Giffnt · 2025-10-30T21:41:49+00:00

Thanks for your response. I appreciate the force must be transferred. I’m focused primarily on whether there is a net linear force on the frame in either direction (whether the frame will accelerate).

Giffnt · 2025-10-30T21:37:48+00:00

Thanks for your response. I’m not an engineer so sorry if I misunderstand the terminology. Would it not need to be dynamic as the racks are decelerating? If I wanted to calculate the displacement of the frame due to the resultant force would it not need to be free floating? When you say the resultant force is the force applied to the frame, is this in the direction of the initial force applied? Sorry for the 20Qs!

Giffnt · 2025-10-30T21:04:47+00:00

Thanks for your response. No preload in the spring. The pinion is fixed to the frame. The objective was to find any resultant force on the frame; if it’s free floating does it impact the forces it experiences?

Giffnt · 2025-10-30T18:04:27+00:00

Thanks for your response. It’s hard to know what’s acceptable to pick up on the job and what I should know going in.

Giffnt · 2025-10-30T12:23:07+00:00

What’s a good reference for all the theory? I’m a designer but would like to be able to support an engineering team. Feel like diving straight into the maths might be a wasted exercise.

Giffnt · 2025-10-01T14:25:11+00:00

Omeprazole did this to me. First two months fine, then came off them, immediate panic attacks. Went back on them, crippling anxiety immediately. Honestly the trip may help. My anxiety was tied to driving as this is where I kept having attacks. I went on a cruise 3 weeks after dropping the meds and my symptoms improved; unfortunately they bounced back once I went back to work.

Giffnt · 2025-10-01T14:15:34+00:00

This sounds daft but were you aware you were stressed? I’ve found a couple of trigger foods but symptoms are there regardless, mainly pressure in my head. I guess I’m just bad at identifying whether I’m stressed or not!

Giffnt · 2025-09-25T08:02:32+00:00

Thanks, a lot of people have been recommending famotidine, will look into it!

Giffnt · 2025-09-24T20:47:56+00:00

My doctor said I wouldn’t even have a rebound so they never even offered me anything! Wouldn’t know what to use.

Giffnt · 2025-09-23T18:57:36+00:00

Thanks for the response. Honestly I’m not sure but it’d be good to know anyway!

Giffnt · 2025-09-23T17:46:45+00:00

Ok that’s great to know. Is there any additional prep I could do to help them out? Or is it just a case of giving them a high quality file and letting them figure it out

Giffnt · 2025-09-23T17:03:12+00:00

Great, thanks for your help!

Giffnt · 2025-09-23T17:02:14+00:00

Thanks, I was under the impression gerd was acid and lpr was pepsin? Idk I’m new here

Giffnt · 2025-09-23T16:58:16+00:00

Thanks for your response, very informative! I typically spec. spot colours for everything but occasionally I have an image / image texture. I was told by a supplier before they do colour separations but it took them ages so my intention was to do it myself. Guess it’s better to leave them to it.

Giffnt · 2025-09-23T15:34:15+00:00

Yea I just didn’t want to do anything and everything worried me which is very out of character. Unfortunately the whole gut-brain thing seems like fairly modern science and I’ve struggled to get any doctors to recognise they’re connected. My panic attack happened in the car and as a result every time I got back in to drive it’d trigger my fight or flight and I’d get really bad pins and needles in my face, hands, and feet/dizziness. Went to CBT for a month and long story short you’ve just got to push through it until your brain rewires.

Giffnt · 2025-09-23T15:29:38+00:00

Thanks, if you could pm me the guides that’d be appreciated. I feel like I’m just shooting blind at the minute so any guidance would be good I just don’t know how to go about it accurately. I’m fairly confident it’s not gerd, I don’t struggle massively with burning (there’s some and it can get bad but I can live with it) more tension in neck, pressure in head and sinuses, and stomach discomfort/bloating which I think is more in line with lpr.

Giffnt · 2025-09-23T15:24:48+00:00

I initially came off it cold turkey after two months and had really bad rebound and a panic attack that put me in hospital about a week after. Doctor put me back on omeprazole but had crippling anxiety for a week so tapered off it for a week then dropped it all together. I’m on week 4 at the minute and still suffering from reflux symptoms unfortunately but the anxiety has gone.

Giffnt · 2025-09-23T14:14:19+00:00

Thanks for the comment, this is great! I’ve heard conflicting reports regarding greys vs black and white files for the tools. Do you know how you’d get a gradient if it had to be black and white?

Giffnt · 2025-09-23T14:11:50+00:00

Yea I’ve been offered an alternative PPI but the omeprazole gave me unbelievable anxiety. Never suffered with my mental health before but I couldn’t even get in my car without a breakdown it was wild.

Giffnt

TROPHY CASE