Search found 955 matches

by Dave_C
Fri Oct 19, 2018 2:56 pm
Forum: General Discussion
Topic: Precision machinist
Replies: 17
Views: 3114

Re: Precision machinist

Those shop classes were the only reason I stayed in school as long as I did. I took every shop class our school offered back when they still had good shop classes and good teachers to teach shop class. Then at an early age, while most of my class mates were trying to figure out what to do for a job...
by Dave_C
Fri Oct 19, 2018 11:26 am
Forum: Home Shop CNC
Topic: MAXNC 10 speeds and feeds question
Replies: 8
Views: 1684

Re: MAXNC 10 speeds and feeds question

Oh, I forgot to ask..how deep would you cut? (Or maybe I misunderstood your answer) Thank you, I appreciate your help. Good question: There are some standards that say never run the end mill deeper than 2 x its width. But they leave out the step over part when they say that. AT twice the diameter i...
by Dave_C
Thu Oct 18, 2018 4:41 pm
Forum: Milling Machines
Topic: Choosing an end mill for the job
Replies: 7
Views: 1774

Re: Choosing an end mill for the job

For the same SFM, number of flutes and chip load an end mill 1/2 the diameter can turn twice as fast cutting twice as many chip per minute. It would seem it would be able co complete one pass in 1/2 the time. Ok, If the tool is only half as wide, then it has to take twice as many passes to remove t...
by Dave_C
Sat Oct 13, 2018 2:58 pm
Forum: Home Shop CNC
Topic: MAXNC 10 speeds and feeds question
Replies: 8
Views: 1684

Re: MAXNC 10 speeds and feeds question

I'm not sure why it isn't taught that way from the beginning as "chip load" is really what determines the feeds and speeds. So here are some sample calcs: Let's say we can only run 3,000 RPM (Maybe too hi an example from some mills but a good starting point) Let's use a 3 flute 1/4" carbide end mill...
by Dave_C
Fri Oct 12, 2018 1:20 pm
Forum: Home Shop CNC
Topic: MAXNC 10 speeds and feeds question
Replies: 8
Views: 1684

Re: MAXNC 10 speeds and feeds question

Mike, I have no idea what your top spindle RPM is on that machine but with 1/8" and 14" end mills I shoot for a spindle speed and a feed rate that will give me somewhere in the .001" or less per tooth for chip load. The smaller the end mill the lower I go so the 1/8" end mill needs something just un...
by Dave_C
Fri Aug 17, 2018 1:14 pm
Forum: The Junk Drawer
Topic: Best Type of Axe for Busting Rotten Stump?
Replies: 84
Views: 11299

Re: Best Type of Axe for Busting Rotten Stump?

Steve, You are a wise man my friend and I kind of got the same take away as you. If you want to learn something about how to "hang and Axe" (most of you have no idea what that means) then watch this video. You don't have to watch long to figure out the "old man" knows what he is doing https://youtu....
by Dave_C
Fri Aug 17, 2018 12:23 pm
Forum: The Junk Drawer
Topic: Best Type of Axe for Busting Rotten Stump?
Replies: 84
Views: 11299

Re: Best Type of Axe for Busting Rotten Stump?

I watched the video all the way through! Obviously the man never had to cut firewood to keep warm in the winter or he would know how to fix a loose ax handle. His $280.00 ax has a loose handle, put another wedge in it and go back to work. It's wood, it swells in wet weather and shrinks in dry weathe...
by Dave_C
Fri Aug 17, 2018 10:10 am
Forum: The Junk Drawer
Topic: Best Type of Axe for Busting Rotten Stump?
Replies: 84
Views: 11299

Re: Best Type of Axe for Busting Rotten Stump?

There is a reason those old axes are going for $80.00 and new ones are cheap! The old ones were drop forged steel and would hold an edge while most of the junk we have today is just cast metal of one sort or the other. Just like our other tools, you get what you pay for. Cheap is rarely quality and ...
by Dave_C
Thu Aug 16, 2018 8:38 am
Forum: The Junk Drawer
Topic: Best Type of Axe for Busting Rotten Stump?
Replies: 84
Views: 11299

Re: Best Type of Axe for Busting Rotten Stump?

The difference between a splitting ax and a chopping ax has to do with the width and taper of the "bit" and the grind on the edge of the bit. And yes, there are single bit and double bit axes of both varieties. The chopping ax has a narrower profile so it can be driven deeper into the wood as you ch...
by Dave_C
Sun Aug 05, 2018 10:20 am
Forum: Live Steam
Topic: How to drill and ream a large-ish hole with drill press.
Replies: 16
Views: 2718

Re: How to drill and ream a large-ish hole with drill press.

Matt, If you are going to use a chucking reamer it has to be started straight and on center with the hole you just drilled or it will be off center and off axis. I would not attempt to do this by hand or with a hand drill. With the part on the drill press, after spotting the hole and drilling the ho...
by Dave_C
Sat Jul 28, 2018 8:08 am
Forum: Home Shop CNC
Topic: Chess Pieces
Replies: 8
Views: 3489

Re: Chess Pieces

Nice! Very, very nice! Harold, thanks for the kind words! My wife was looking at the set and she ask me "Do you realize all the skills that you had to acquire before you could make that set?" And then we started going over how it all came to be, realizing that most of the know how was obtained from...
by Dave_C
Fri Jul 27, 2018 10:53 am
Forum: Home Shop CNC
Topic: Chess Pieces
Replies: 8
Views: 3489

Re: Chess Pieces

I don't have a CNC mill so making the knights in 3D is not something I have the tools to do Well I solved that problem and completed the G0678 CNC conversion with a Centroid/Acorn controlled mill with Clearpath servos! So I took a shot at making the knights. After 32 revisions of the drawings, tryi...