The Workshops

[Pink]

Sounds a bit like discord F9 engineers

"You ducking donut, you made a rocket that looks exactly like a F9 but can't carry crap!" -what I want to say to them.

 

[TtTOtW]

Lol. Let's team up. We'll call it... Team Rocket.

 

[The Dark in the Light]

Lol. Let's team up. We'll call it... Team Rocket.

XD

 

[8BitCosmonaut]

Second year of engineering school, still have a machining class.
View attachment 49062

Looks pretty good, you should polish it.

 

[Pink]

Looks pretty good, you should polish it.

Making it look good? Low priority.
I'm still learning. That thin disc which I did on the lathe goes from 4.4mm thick in one part of the edge to 5mm thick in another part of the edge. Hopefully that doesn't affect anything.

 

[8BitCosmonaut]

Making it look good? Low priority.

That is true, but sometimes it's not about looks, polishing is important when it comes to dynamic seal applications in pistons, as it removes the tiny cutting ridges along the surface that can increase friction and wear upon the o-rings, hell it might even cause leaks.

Since its just a practice piece, that'll be good to go.

That thin disc which I did on the lathe goes from 4.4mm thick in one part of the edge to 5mm thick in another part of the edge

So there is an unintentional taper? Maybe you can double check the angle of the top slide. You can maybe run a dial gauge along the side of the slide to check where it is tilted towards, then use a hammer and lightly tap it until it's zero-ed.

EDIT: a 0.6mm deviation is huge!!!

 

[Pink]

So there is an unintentional taper? Maybe you can double check the angle of the top slide. You can maybe run a dial gauge along the side of the slide to check where it is tilted towards, then use a hammer and lightly tap it until it's zero-ed.

EDIT: a 0.6mm deviation is huge!!!

I blame my machining process...

Start with 12mm thick cylinder, stick it into lathe.

Face off side A.

Take out, flip, and face off side B. Bore the hole with drill bit and reamer in the lathe tailstock while it's in this position. Obviously if I did this right, side B should be nice and normal to the hole. Side A at this point is probably not normal because of chuck errors and stuff.

Then like the doofus I am, I think I loctited the cylinder to the steel shaft with side A facing in towards the chuck, and side B facing the cutting tool..
I then faced off side B until I measured the thickness at 4.5mm. but the rest wasn't 4.5mm....

So I think that's what went wrong.

 

[8BitCosmonaut]

I blame my machining process...

Start with 12mm thick cylinder, stick it into lathe.

Face off side A.

Take out, flip, and face off side B. Bore the hole with drill bit and reamer in the lathe tailstock while it's in this position. Obviously if I did this right, side B should be nice and normal to the hole. Side A at this point is probably not normal because of chuck errors and stuff.

Wait a minute, so you're saying the cylinder is "slanted" in the chuck?

 

[Pink]

Wait a minute, so you're saying the cylinder is "slanted" in the chuck?

Yup, that's what I'm thinking. I've noticed that it's hard to get short cylinders to sit perfectly straight. Though there's probably a technique to make sure they're correctly straight.

 

[8BitCosmonaut]

Yup, that's what I'm thinking. I've noticed that it's hard to get short cylinders to sit perfectly straight. Though there's probably a technique to make sure they're correctly straight.

Say, crasher, where do you buy your lathe's stock materials?

 

[Pink]

Say, crasher, where do you buy your lathe's stock materials?

They magically appear in the workshop when the curriculum calls for them.
Seriously, I've never experienced purchasing stock yet. I know it sounds dumb.
But I imagine it's purchased online from a local-ish website that specialises in different kinds of stock. A one-stop shop for all your stock needs?

 

[8BitCosmonaut]

They magically appear in the workshop when the curriculum calls for them.
Seriously, I've never experienced purchasing stock yet. I know it sounds dumb.
But I imagine it's purchased online from a local-ish website that specialises in different kinds of stock. A one-stop shop for all your stock needs?

Yeah, same thing back in technical school, the materials are just there, now that I am doing this as a hobby, I dunno where the hell to get them.

So far from my research on other machining forums, the recommend looking for machine shops nearby and ask if they sell the leftovers.

 

[TtTOtW]

Billet and sheeting, as well as extrusions can be bought locally at a place called Steel Pipes and Fittings. Don't you have a dedicated steel supplier nearby? We also have a place called Non Ferrous Metals, specialising in Aluminium and other metals.

 

[TtTOtW]

What dimensions are you looking for, Cosmo? And which metals?

 

[Pink]

Today's machining progress. Almost there...
I hate external threading.

 

[8BitCosmonaut]

Today's machining progress. Almost there...
I hate external threading.
View attachment 50067

What's this used for?

 

[Pink]

What's this used for?

An engine thing that's supposed to run on compressed air.

Only rougher and cruder than my CAD model.

 

[Chara-cter]

Just wondering. Is there anyone who saved their life using the forward assist on the AR-15 (M4, M16, C7,...)?

 

[Horus Lupercal]

Just wondering. Is there anyone who saved their life using the forward assist on the AR-15 (M4, M16, C7,...)?

Bloody well hope not.

 

[8BitCosmonaut]

Just wondering. Is there anyone who saved their life using the forward assist on the AR-15 (M4, M16, C7,...)?

JLMC! Haven't seen your messages in ages!

 

[Mars Pathfinder]

JLMC! Haven't seen your messages in ages!

lol

 

[Chara-cter]

JLMC! Haven't seen your messages in ages!

I was busy lately. I made some cool stuff while I was gone, will post them here Soon™

 

[TtTOtW]

Oh great! Missed you man!

 

[Chara-cter]

Since I haven't posted here for a while, here are some stuff I was working on:
M829 APFSDS

The slide of the Sig P226, I did make a papercraft template of it but haven't finished it , I'll finish the rest of the pistol soon™

The (almost finished) lower receiver of the Sig MCX

The Mk16 rail by Geissele on the Mk18 Mod 3 (yes I know it's not the official name but people call it so meh)

 

[8BitCosmonaut]

Since I haven't posted here for a while, here are some stuff I was working on:

Hey what modelling software did you use? It looks like Fusion 360.