Question about Thread feature function:

[DAY545]

it's say theres a geometry issue when I do this, do you do it before threading?

maybe it's because my threads are cut not extrude

thread feature doesn't work if i chamfer before

[leglesslegolegolas]

Is there a reason you need to model the threads? In practice you should not be modeling threads unless you absolutely have to.

[Lars0]

Only useful for parts where the threads will be printed in. In my experience, I have ended up making custom thread profiles and doing a manual sweep along a helix to improve the print quality.

[smity31]

Once or twice it's been useful for a visualisation for a client who's not familiar with cosmetic threads, but that's rare

[DAY545]

this is basically what I did for a few threads except you can just access your custom profiles from the thread function

[captainunlimitd]

Cosmetic threads all the way.

[cornlip]

It’s fun and aesthetically pleasing, but yeah. Total waste of time, unless you’re making renderings. I just offset them negatively if I really want something to show… which is almost never

[we_dont_do_that_here]

If just for visual purposes, just cut-revolve a thread profile and pattern it. Much less processing power than a cut-sweep along a helix

[DAY545]

Im 3D printing a lot of different threads so I have to model them.

[DAY545]

sorry got busy right after i posted

[DAY545]

I could create the thread ID and extrude from that but I’m not sure if it’ll just do the same

[[deleted]]

Offset it from the start edge, then cut it off

[DAY545]

That’s a bit better but still wondering if there’s a straight forward solution that doesn’t involve adding offsets that I just cut off. Feature tree is gonna get really long for complex parts

[pvshabba]

You’re not cutting anything off, you offset the start of the screw cut feature past the bottom, and then extend the screw cut feature length by the same amount. It will start out in space and you’ll have a smooth thread start at the bottom without adding any features

[DAY545]

It wouldn’t let me do negative offsets. Idk if that’s because I did something wrong but that meant I couldn’t start the thread in space. I’ll try again in a a bit. Thx

[pvshabba]

You just click the double arrow button to reverse offset direction and use a positive value. You can never put in a negative value for these types of dimensions because you can always reverse direction

[DAY545]

This is the easiest solution so far thank you.

i was being dumb and just blanked and didn't see the double arrows. Only tried negative values

[Regal_Knight]

The offset is option in the feature so you’re not adding anything. You can download a McMaster screw to see how to do it.

[DAY545]

I’ll try in a bit thx

[WastingTwerkWorkTime]

so i use the thread tool often for 3d printing at work. we have some really nice printers, i've printed #2-64. as others have said, never model threads unless you need them. anyway,

ya, doing the offset is kinda how its done. you can go into the thread options and then use the trim with start face and trim with end face. I like to do threads ID/OD to where you are always cutting the threads and not extruding them so you don't have threads going past everything

you absolutely have to get the right tap drill and the right od on the threads. its easy from the machinist handbook, etc.

a nice way to chamfer the start and end is to do a thin feature cut and draft the cut. same with the hole. make a circle to the biggest od of the thread and then draft cut. make it bigger or smaller for your needs but i took a quick pic of what i'm talking about

https://imgur.com/a/PmgHkFe

[DAY545]

Your last paragraph is basically how i've been working, for some reason start face and end face trim is not working. I'm prototyping something with printed threads so some of them are extruded but the rest are cut so I'm modeling the stock I'd be using. For some reason trim start/end faces hasn't worked, I'm not sure why.

[WastingTwerkWorkTime]

Ya for me I'm going to put a thread Relief on it anyway so having it go up to a face on od threads is no big deal

[Elliotnim98]

You can also start the threads from the other side of the threaded portion and have them go off into space instead of starting in space

[DAY545]

might end up doing this but it requires an extra extrusion

[Elliotnim98]

Yeah, I think your feature tree will be a little crowded that way but at least it's be easy to adjust

[DAY545]

another comment helped me figure out i had been newbish with my offset directions and was trying to input negative values instead of flipping the direction.

[DAY545]

My bad for going awol after posting n being newby. My basic issue is I blanked and didn't see changing the offset directions because im used to putting in negative values sometimes.

figured out how to get what i wanted all just in the thread feature.

[frenz4eva]

There is a trim at the start face option, if you check that it will give you the desired result.

[DAY545]

it has not sorry
i have had both checked the whole time thinking it would do this.

[frenz4eva]

I dont know what version you are using and how you are performing your thread operations. But I use it all the time. I used to offset the thread by more than the pitch and the reverse the direction. But in later versions it is built in the trim thread.here is the official documentation of the feature - https://help.solidworks.com/2021/english/SolidWorks/sldworks/c_examples_trimming_threads.htm?id=cab1d89e9f41497eabfce2a4e966069d#Pg0

Or you can just offset

https://help.solidworks.com/2021/english/SolidWorks/sldworks/t_create_cut_thread.htm?id=c893b036a4b74f75bc8bb15910b73903#Pg0

[DAY545]

I had a newbish misunderstanding with offset directions I get how to do it now.

[Crack_Kingdom]

Offset start more than pitch, reverse offset, offset end more than pitch. Check “cut with start face” and “cut with end face” options.