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Lazy. They want to dog the job so they have to do as little as possible. It has nothing to do with such highbrow concepts as tool life or chatter; most machine operators who do this kind of...

I concur - something is wrong. .010 @ .1 is not a particularly beastly cut, especially for a 3 hp machine.

Unfortunately, there's no way to "prove it" for the average DIYer. Real machine accuracy tests are done with rather expensive equipment.

However, you can fake it a couple ways and get a ballpark...

The tires on dragsters become very sticky when they heat up. That's what the burnout does - heat the tire up and clean it off. They're also wrinklewall tires, so they press as much "glue" into...

You know, that's a really good question.

I think DMG had the same thought you did. If I recall correctly, they offer three spindles. 10k, 28k, and 52k (at a monster ~50 hp).

Your guess is...

Yeah, I confused inches/min^2 with inches/sec^2. My apologies.

Geof has it spot on.

I think the difference is relative experience. If you work with both tools frequently, they're pretty much equal insofar as programming is concerned. Certain operations can...

23,040 in / 12 = 1920 ft/sec

That's a little faster than 32.2 ft/sec^2. Go look your units up, you did the math as though we were on Jupiter.

1g = 386.09 in/sec^2

Edit:

I'm retarded,...

I feel a two speed is in order as soon as you put anything other than Al on the table or want to tap "serious" holes. All our good multipurpose machines at work have two speed heads.

The Haas at...

That's pretty decent. 2820 IPM, .6g accel. Takes about 3 1/2 seconds to go from still to moving full tilt.

Max speed is not a function of maximum accel, they're independent stats. A little like...

In CAM, output the proper code. That is, have it go to the proper depth of cut as if you were really cutting metal. On the machine, edit the work coordinates (where you set up your XYZ on the part)...

Repeatability and accuracy are not the same measurement. Never have been. I would be shocked if someone who was in the machine tool business confused the two. But if prompted, I wouldn't place a...

Positional accuracy refers to absolute accuracy in some range, either by some increment or over the entire machine envelope. You tell it to go to 1,1. Is it at true 1,1? If not, how far off is it?...

The higher-end machine controllers (stuff you see on 250k machining centers, for example) have simultaneous, high-bandwidth servo loops. All axes update simultaneously, and there's a lot of them...

Hardening and annealing are exact opposites in terms of what they do to the material.

If you want to harden something, you are going to re-introduce stress into the material, and crappy steel...

It's impossible to say what they do without knowing something about their process or what material, specifically, they purchase.

They could buy annealed/stress relieved material; they could heat...

Blanchard grinding is vertical spindle grinding on a rotary table. If you have a 4' bar, which isn't unreasonable, you need 4' diameter swing on the blanchard, which is unreasonable for a DIY...

Knee mills are for places who have light machining requirements and a lot of time on their hands to wait for the machine to finish what it's doing. They're good machines for home shops and places...

That's a high speed machining video.

You'd need around 20 horsepower, a 12k+ rpm spindle, and a pretty expensive indexable endmill. That kind of machining is not something you just walk up to a...

I think Geof has said basically everything that needs to be said.

We had one guy rip the entire back end (all the covers, wires, et cetera) off a machine by having a little too much material...

There's always the long way - scraping it.

My company makes air bearings, so I can't give you any design information.

Air bearings are very rigid. The gap does change, but the forces required to do so substantially are high enough so they...

Signed.

MDI is a critical tool for working effectively and efficiently. Some things should be in a program (any real machining moves), but other crap just doesn't make sense to put there. ...

There's an underlying effect that goes on besides the martensitic transition, even in steel, that allows other materials - from carbide to plastics - to undergo successful cryo treatment.

The cold...

The trick, from talking to and reading from folks who do it, is to find a reputable place and pay a few extra dollars to get it done. A poorly done cryo treatment will decrease the life of the tool,...

I agree, boring random diameters defeats the purpose of soft jaws. You can keep re-boring/re-facing the jaws until there's pretty much nothing left, or save a couple at specific sizes for jobs you...

You are going to have to do a lot more reading about what HSM is, because the questions you are asking are very "traditional machining" oriented and are not really what HSM is about.

Modern...

I suggest spending the money to learn the machining from somewhere before buying a damn thing. Community colleges usually have at least a basic machine shop. If they only have one class, take it...

http://machinechat.freehostia.com/

I started a machinist chatroom a month ago or so, and we've got a couple regular people hanging out. More are always welcome. If you like it, I recommend you...

Read the original post again. The title is "How good of a finish do you get on the TM series mills..", and goes on the specify aluminum in the body. He does not once mention spindle speed or...