Any machinist here?

I have a small part I need made. It's simple enough that I could literally make the thing using a file and a drill press. I'm trying to use this as a learning opportunity. If I brought this in, what questions would you have, what did I do wrong? I'm hoping it's not completely wrong.

 

@six5crèéd

 

And friends

 

Shop Time with Crèéd & Friends. Now with fresh strawberries and a poll.

 

https://www.tacomaworld.com/threads...ries-and-a-poll.669927/page-978#post-25666598

Ask this here, there’s a few people who make drawings for a living who can help you.

I think it looks good

 

There's no call out for material specs that I saw.

I'mma go middle school math/physics teacher on you, is this steel, aluminum, bamboo, bananas,

But otherwise looks pretty simple.

If you wanted to make this yourself I would probably take some tubular stock, put it in the lathe turn it down to your desired diameter then put that in end Mill and do your flats and bores.

What is this part for?

I see drives spline coupler but which drive splines are you attempting to couple?

Also curious what you used to draw this up? Fusion 360?

 

stand alone CMM

 

No overall width, no hole spacing.

 

Need to add:
-Surface finish call out... 16Ra on turned surfaces, milled surfaces, etc.
-Material, as specified above
-Hole spacing from ends not specified
-Do you really need .01mm tolerance (.004”) on a 15mm long part? Seems wayyyyy too tight and will add a lot of cost.
-Assume the holes are centered but there is not a centerline to specify this.
-And likely some Other GD&T Issues that a drafting guru would call out.

 

+/-.004"... shiiiii.... all day.

 

So I've been poking around TW just now trying to find a thread for Machinists... (hence why I'm here) and most I found are old and not really what I'm looking for. This is a recent thread though.. and I notice a few people from other threads I was reading.. So, I'm going to ask here. Any general threads for Machinists? Say... the PracticalMachinist of TW? I work for a Precision Machine shop.. mostly Aerospace/Medical/Semiconductor/Automotive.. tight tolerance shiz usually... but we're technically a job shop still. My jobs range from exotics to trinkets. I'm sometimes research stuff when getting into a job, and would love to use a source I already know and trust.. (well.. most of you anyways..lol). Plus.. why not expand on the sense of community here on ol' T-Dubs. maybe a place to share jobs/parts? programming and machining tips and hacks. etc

 

Except +/-.01mm is actually +/-.0004”. If OP can do that with a file & drill press then he’s a top notch tool & die maker.

 

rtzx9r caught everything I would have.

Something I used to do to error-check my own or a co-worker's drawing, was to make a new 3d model from scratch using the drawing as my only source of Information. It's a pretty reliable way to find out what dimensions are missing on the drawing.

 

That’s a good idea.
My method for checking drawings is to look at every feature and ask

What?
Where?
How Big?

I start with the drawing title block to make sure it has all the basic info, then go to the part as a whole (have more than once had a machinist come back to me because they couldn’t figure out how big a piece of stock to start with).
After that, go to each hole, cutout, etc. and ask the same questions.
If all that info is there, drawing should be pretty complete.
By rights I should have someone check all my drawings - we push the younger engineers to do that - but since most of the parts I draw will be made in-house, I figure if something is missing they’ll come bug me.
Best are parts I’ll be 3D printing - no drawing required.