Cutting Speed and RPM on the Lathe and Mill

[Mayhem]

(10-02-2013, 07:16 AM)TomG Wrote: Darren,

I'm debating the value of a feed rate video for the hobby machinist. I can show how to calculate the feed rate based on chip load and rpm, but most powered feeds on home machines are either variable or non-existent. I can't remember the last time I calculated a feed rate and then actually applied it. It's more "that sounds about right" or "the color of the chips is good".

Tom

Tom - it wouldn't hurt to show how such calculations are done and what the various variables actually mean (i.e. their practical application).

[TomG]

Best calculator ever devised. I bought it new in the mid 80's and pretty much use it daily.

Tom

[Mayhem]

(10-02-2013, 09:20 PM)arvidj Wrote: Wow, an HP calculator and RPN to calculate RPM.

That is the second time this month I've seen an old HP.

(10-02-2013, 10:25 PM)TomG Wrote: Best calculator ever devised. I bought it new in the mid 80's and pretty much use it daily.

Tom

Am I missing something here???

[EdK]

(10-03-2013, 10:17 AM)Mayhem Wrote:

(10-02-2013, 09:20 PM)arvidj Wrote: Wow, an HP calculator and RPN to calculate RPM.

That is the second time this month I've seen an old HP.

(10-02-2013, 10:25 PM)TomG Wrote: Best calculator ever devised. I bought it new in the mid 80's and pretty much use it daily.

Tom

Am I missing something here???

I hesitate in saying, probably not.

HP = Hewlett Packard
RPN = Reverse Polish Notation
RPM = Revolutions Per Minute (Oh, you probably knew that. )

Ed

[Micktoon]

Hi Tom , another quality video , thanks for going to the trouble of making it
If you are still looking for suggestions for topics, milling Tee slots and milling dove tails is something that is useful to know about, especially any tips from experience
I know you have been super fast in the past Tom , but honestly just when ever if you fancy doing them

Keep up the good work
Cheers Mick

[TomG]

Thanks Mick, it's good to get this type of feedback on the videos. Both milling T slots and dovetails are already on my list of topics and I'll move them to the top. I'm hunting in the north woods with my son at the moment but will be back in the shop next week.

Tom

[henryarnold]

Guys,

Please excuse a plug for my product. The MachTach will measure RPM on any machine tool and calculate SFM based on any diameter end mill or diameter lathe work piece. Someone will probably point out that you can buy a hand held tachometer for $5.95 on EBay but the MachTach looks nicer, calculates SFM, and is fun to put together. It gives a steadier reading and its also always ready to go when you install it on your machine. It works great with lathes, mills, drill presses, and even sanders and conveyor belts.
http://www.machtach.com

Henry Arnold

[EdK]

(10-03-2013, 11:16 PM)henryarnold Wrote: Guys,

Please excuse a plug for my product. The MachTach will measure RPM on any machine tool and calculate SFM based on any diameter end mill or diameter lathe work piece. Someone will probably point out that you can buy a hand held tachometer for $5.95 on EBay but the MachTach looks nicer, calculates SFM, and is fun to put together. It gives a steadier reading and its also always ready to go when you install it on your machine. It works great with lathes, mills, drill presses, and even sanders and conveyor belts.
http://www.machtach.com

Henry Arnold

I can vouch for Henry's MachTach. A great product at a very reasonable price. Made entirely in the USA and Henry is very responsive to questions and problems.

Ed

[Mayhem]

(10-03-2013, 11:35 AM)EdK Wrote: I hesitate in saying, probably not.

HP = Hewlett Packard
RPN = Reverse Polish Notation
RPM = Revolutions Per Minute (Oh, you probably knew that. )

Ed

Ahh - its all so clear to me now! I thought there was a missing link to an online calculator or something Then I recall Tom using a calculator in his video...

[Highpower]

(10-04-2013, 05:35 AM)EdK Wrote: I can vouch for Henry's MachTach. A great product at a very reasonable price. Made entirely in the USA and Henry is very responsive to questions and problems.

Ed

on all counts.

Machtach thread...