Using G-Wizard to Calculate Feeds and Speeds for Fly Cutters and other Manual Machining Conundrums

This article is the newest chapter from our Feeds and Speeds Cookbook. The original is in the Cookbook here.

I got an email from a customer the other day who wondered if there wasn’t some way to make G-Wizard more focused to the needs of manual machinists. He felt that it was overly “CNC specific”, and wanted some sort of “CNC versus Manual” switch to make it easier. I need to cogitate more on the idea of a switch, but it is certainly true that if you start dialing up modern tooling in G-Wizard and cutting softer materials, you will end up with feeds and speeds that are impossible–the manual machinist just can’t crank the handwheel fast enough.

Let’s back up just for a second and realize a key thing:

The physics are the same for the cutter, whether it’s a manual machine or a CNC machine.

I’m tempted to respond as one famous Starship Chief Engineer did with, “I canna change the laws of physics, Captain!” But, that’s just telling us we need to think about the problem differently: we don’t have to change the laws of physics, we just have to apply them properly.… Read the rest

Ever wonder why CNC is so much more sensitive to cutting speed than manual machining?

It turns out to be a function of the capabilities of the machine and the machinist. Simply put, the CNC can do all sorts of things a manual Bridgeport never was in the running for. Learn more in my latest article about CNC Cutting Speeds.

… Read the rest

Manual Lathe Survey

It’s time for a survey. Let us know what size manual lathe you use most often (swing and distance between centers, plus spindle bore optionally).

What size manual lathe do you use most often?

Click Here for the Survey or to See Results… Read the rest

Wondering How a Manual Machinist Can Learn to Use CNC Quickly?

If you’re a manual machinist, you’ve probably wondered about CNC. Maybe you’ve heard others talking about how CNC is only good for producing lots of copies of the same part, and prototyping is much faster on a manual machine. That just isn’t true! In fact, once you get the hang of it, you can make a CNC act just like a manual machine that has power feeds on every axis and a DRO. You’ve got to admit, you really could do some wicked cool prototypes on a machine like that.

Gotta love those old tracer machines!

Want to find out more? Wander over and check out MDI: CNC for Manual Machinists, the latest installment to our Online G-Code Tutorial.… Read the rest

QCTP Boring Bar Holders

I’m a firm believer that you can never have too many boring bars. If nothing else, this is an application where rigidity is always a problem as you reach down a hole with that long skinny boring bar. Shorter bars and fatter bars are more rigid, but they don’t work for every case. So you wind up needing a big enough selection so that when you go to find the shortest fattest bar that will work, you’re in luck.

With those random thoughts in mind, I enjoyed seeing this photo over on Chaski of Frank Ford’s set of boring bar holders for the QCTP lathe:

They look like they’ll hold the bars with less chatter than the usual cheezy stick-the-bar in a square slot holders…

And while we’re on the topic of boring, though not of QCTP boring, how about Glenn Wegman’s horizontal boring setup on his lathe from the same Chaski thread:

Notice he built a table to sit on the cross slide to hold the work…

With machinists, where there is a will, there is a way!… Read the rest

Making a Lathe Compound from Scratch

This was an enjoyable video I came across:

I might follow a similar approach to make a gang slide for my Lathemaster 9×30.… Read the rest