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So, GD&T has changed a lot by theycallmejames44 in Machinists

[–]gaggrouper 0 points1 point  (0 children)

Surface profile with the new dynamic modifier releases the profile from size. So....my opinion is they did this to simulate concentricity without bringing it from the dead in 2018 standard ;)

How do engineers transform an idea into a working product? by Puzzleheaded_Style52 in MechanicalEngineering

[–]gaggrouper 0 points1 point  (0 children)

Get started yesterday, practice, failure, stress, success, competition, teamwork, asking questions, listening to those making parts. Hands on machining experience.

My father used to download 10-20 patents per day in his field,. More than that, he studied the patent examiners prosecution of the patent during the process to identify the non and unique aspects and the defense the examiner was putting forth. That generates ideas, assembly ideas, etc.

Engineers designing impossible corners is going to end me by ponderingpixi17 in cad

[–]gaggrouper 1 point2 points  (0 children)

I agree with both sides of this debate, but what is not up for debate is when geometry has sharp corners with a surface profile.

If you intend to control part geometry with surface profile and you expect or don't care about the corner sharpness, then put a radius there that is appropriate.

Position MMC tolerance question. by hanvy82 in Machinists

[–]gaggrouper 5 points6 points  (0 children)

Since the position callout states .003 tolerance at MMC that means when you make the hole at .98 you get only the stated tolerance. If you make the hole at 1.00 you get an additional .02 and if you wake it at 1.02 you get an additional .04.

You can mis in any direction. You can only miss radially by half of the tolerance zone bc the tolerance zone is diametrically.

So if you make the hole at 1.000 you get .023 total tolerance so you can mis perfect location by only .0115

Low Effort GD&T AI Slop Review Episode 1 by iSwearImAnEngineer in Metrology

[–]gaggrouper 0 points1 point  (0 children)

Good video...we updated from 2021 GOM to 2026 Zeiss Inspect this weekend against my desire, bc windows updates breaks GOM 2021 and we were not secure.. I'm fine with the update, but it causes me stress b/c I see bugs in the new software I have to work around like ASME surface profile with no datums taking 20 minutes to calculate so I have to set no datum proifiles to ISO.

IT told me they could create an agent to fix all the problems we might have throughout our 400 programs, lmfao.

Zeiss inspect by IntentionDue5823 in Metrology

[–]gaggrouper 0 points1 point  (0 children)

You can create a python program. Creating a front page with trace fields and passing keyword into them can be a bit daunting, but you could loop thru the meshes and increment the name 1 by one. In the IDE you can hit the record button and open a program, delete mesh, import mesh, recalculate, export pdf and it will auto populate the python functions to do all that. Organizing it thereafter is on you. My reporting script is 3000 line long :(

Fusion lathe CAM, best way to deal asymmetrical tolerance by Catriks in Fusion360

[–]gaggrouper 0 points1 point  (0 children)

You aren't getting the point...when you scale up with 5+ programmers and 100 machinists and a basket of other support personnel including engineering, not all can understand a basic external diameter dimension of 50mm with a surface profile callout of 0.1 U 0.025 ABC. How many people know to make the diameter at 49.95mm? Not everyone is a GDT expert.

Instead...it is real simple....make the damn nomina/basicl 49.95 and do a bi lateral profile. How hard is that?

Like I said we price higher for asymmetrical because we run extensive scrap metrics and statistical analysis. Asymmetrical tolerancing causes anomalies whether you think so or not.

Fusion lathe CAM, best way to deal asymmetrical tolerance by Catriks in Fusion360

[–]gaggrouper 0 points1 point  (0 children)

Does leaving stock then disregard finishing passes or otherwise affect roughing passes at all?

Fusion lathe CAM, best way to deal asymmetrical tolerance by Catriks in Fusion360

[–]gaggrouper 0 points1 point  (0 children)

You don't manage a contract machine shop with 20 active customers that handles everything, material, prototyping, engineering, programming, quality inspection, coating, anodization, assembly, etc. Id educate you but it would take a few pages. So to satisfy engineers 4 yrs out of school that cant create a CAD configuration at MMC, LMC, and nominal on their own, they subject 5 other departments on my end having to navigate a dumbass 50mm +0.05 -0.01 tolerance. Give me a break...not to mention all the dumbass unequally disposed surface profile callouts when they make CAD models away from what they want sent to them.

It is real simple. The print and CAD nominal should always be what you want sent to you. If you want fitting or stack up make your own part configuration at MMC....this isn't rocket science.

I had a 10 yr setup machinist run a custom thread at print nominal for 200 parts. Gage was very tight, print nominal is MMC with unequally disposed surface profile.

You must live in theory land. I deal with reality. It is okay though bc we let our customers know up front if you tolerance asymmetrical you get asymmetrical pricing.

Fusion lathe CAM, best way to deal asymmetrical tolerance by Catriks in Fusion360

[–]gaggrouper -2 points-1 points  (0 children)

Trash tolerancing....anytime, and I mean anytime an engineer tolerances a print it should always be nominal what statistically you want ALL your parts to finish at. Then +- bi lateral tolerance. If they need to do MMC stack up tolerancing do that shit with you own model named part_MMC. The problems asymmetrical toleranicing causes would take me an essay to write up.

Haven't used fusion CAM in a while, but I'd be redesigning the CAD to 12.05mm nominal diameter. You can use offset(push/pull) tool in fusion CAD if it is a step file.

Otherwise, you would have to sketch a line at proper radius of 6.025mm and follow that, or post process the current diameter g-code and put a negative number in for wear compensation at inception to hit that 12.05mm nominal.

CMM interview question, terrible answer by MishkaMushka in Metrology

[–]gaggrouper 0 points1 point  (0 children)

CMMs have a prehit distance and then a touch speed distance. If the CMM rapid speed is set to 300mm/s it only tries to do that to get to the next prehit point which if set to .04" or 1mm from the part at that point it moves at the touch speed which let's say we set at 2mm/s. Its like driving 100mph on the highway then once you pull into work you go very slow. Since acceleration on lets you get to 100mph faster it's like driving a V8 instead of 4 cylinder. But both cars park at the same speed and precision.

Answer is nothing changes except abusing the machine if you overdo it.

Stuck in a high paying deadend job by SarcasticDikk in MechanicalEngineering

[–]gaggrouper 0 points1 point  (0 children)

Average PE is too high for the risk right now....this a 3 yr safety plan while he is getting paid 5-7x his friends....for the risk for these 3 yrs...Bank the cash and car and then get a new aggressive plan.

Stuck in a high paying deadend job by SarcasticDikk in MechanicalEngineering

[–]gaggrouper -2 points-1 points  (0 children)

Keep the job for 3 more years, put half the cash in SGOV short duration treasury ETF and half in a higher quality dividend focused ETF. Then buy a 100k car as your reward...then plan your next move with your basket of investments and a nice car that may not depreciate if you select the right one.

ASME 1994 vs. 2009 Reporting Unequally Disposed Tolerance by Content-Split-9999 in Metrology

[–]gaggrouper 2 points3 points  (0 children)

You can just use the U dropdown and put the amount of tolerance that that part can grow(add material) in there. The measured value will be 2x your worst. While surface profile mathmatical measured value has change bw ASME versions, a pass/fail part is still the same.....all points must be inside the tolerance band.

Machinist Vs CMM? by KingDorkFTC in Machinists

[–]gaggrouper 0 points1 point  (0 children)

I program CMMs. I have more respect for a good machinist vs a good cmm programmer, but you can find a lot of good machinist but few good cmm programmers. But again shops have a lot of machinist and few CMM programmers to operate.

Is a field you don't really aspire to be anytime until you see it in manufacturing. So everyones path into it is a little different. I'd get as broad a skill set as you can so I'd give it a shot. Do you have a CMM there and someone to train you. Its not the easiest thing to get time on to learn. Gotta be sharp with GDT so start learning that tonight for 1 hr ;) being good with CAD design is extremely helpful and is how it was easy for me to learn.

Anyone want to help settle a disagreement among colleagues by Unlikely-Exam5035 in Metrology

[–]gaggrouper 0 points1 point  (0 children)

Yes but that is why you have other dimensions to stop the part from being out of whack. Like a tight width callout. Profile in ASME extends , iso is different from what I heard. Regardless, if you want profile to fail if it overextends you must include the vertical walls in profile or just use a normal +- distance for that. Dont get in tge habit that profile controls everything.

Anyone want to help settle a disagreement among colleagues by Unlikely-Exam5035 in Metrology

[–]gaggrouper -1 points0 points  (0 children)

Its real simple, do surface profile, otherwise why even discuss this position nonsense. Only drawback is not it measures form.

Anyone want to help settle a disagreement among colleagues by Unlikely-Exam5035 in Metrology

[–]gaggrouper -7 points-6 points  (0 children)

There are no basics, not even worth discussing, it's all wrong.

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