View Full Version : Hot summer day, machining

08-02-2004, 08:25 PM
So, It is so hot today that I was forced to go down stairs and do some machining. It is maybe 15° cooler down there.

Here is the mock up of the parts I cut for the milling machine. Lotsa crap in the background.


Flycutter in the lathe using the power crossfeed (electric): Never mind the crap, that's how I work.


After cutting in the lathe with the fly cutter (coool) it looks like this:


Totally unrelated, here is the latest incarnation of my 30 year old lawnmower. It starts on the first or second pull.


[This message has been edited by Evan (edited 08-02-2004).]

08-02-2004, 09:37 PM
the Stealth mower..... doesn't look like it's getting much use right now.

08-02-2004, 09:42 PM
Nice flycut!Are you going to use rod rails for the x axis too?

Lawnmower,best kind too,simple as dirt,twice as cheap http://bbs.homeshopmachinist.net//biggrin.gif You could get ten more of those,plus some flabby old women and start a new exercise craze http://bbs.homeshopmachinist.net//biggrin.gif "Mow,mow,mow your way to firmer buns and thighs"!!!!$19.95 http://bbs.homeshopmachinist.net//biggrin.gif

08-02-2004, 09:55 PM
What does "hot" mean in your area? What is the intended travel of your milling machine? XYZ? Why did you decide to build your milling machine out of aluminum instead of steel? Some of the old SB lathes have hydrodynamic spindle bearings (similar to automotive) is that the way your lathe is set up? That type bearing is much smoother than the ball bearing type spindles used in the later models. The SB I have is similar to yours but has the belt and gear covers. Always interested in your posts.

Mike W
08-02-2004, 09:56 PM
"Never mind the crap, that's how I work." Thanks Evan, I do the same thing. http://bbs.homeshopmachinist.net//biggrin.gif

Nice start on the mill.

08-02-2004, 10:21 PM
That mower just needs some flames painted on it.

08-02-2004, 10:26 PM
Glad to see I am not the only one that thrives in CHAOS.
Was so bad yesterday, I couldn't find a plastic box, about 12" square after I sit it down.

08-02-2004, 10:30 PM

How hot? Around 96°F

Aluminum? Light. Easy to machine. I am a slack ass when it comes to machining. I like easy. The ways will be all round precision ground, X, Y, and Z. Special compensation is designed in to allow for the differential cooefficient of linear expansion of the aluminum vs the steel ways, in all directions.

[This message has been edited by Evan (edited 08-02-2004).]

08-02-2004, 10:37 PM
I bet the grass doesn't even see that thing coming http://bbs.homeshopmachinist.net//smile.gif

08-02-2004, 10:41 PM
<font face="Verdana, Arial" size="2">Originally posted by mochinist:
That mower just needs some flames painted on it.</font>Naaah, it needs some knarly lookin' spikey things stickin' out all over with a big blower on top. Call it the "Yard Warrior." Dress up like Mel Gibson and steal gas from the neighbors. http://bbs.homeshopmachinist.net//wink.gif

Dave Opincarne
08-03-2004, 12:42 AM
So if it was so hot I have to ask...Did you keep your shirt on? http://bbs.homeshopmachinist.net//biggrin.gif


08-03-2004, 08:37 AM
No wonder its lasted so long, there's no lawn to make it work hard.

08-03-2004, 09:20 AM
What's a shirt?

08-03-2004, 09:23 AM
hey, I work in squalor too http://bbs.homeshopmachinist.net//smile.gif


08-03-2004, 01:22 PM
http://bbs.homeshopmachinist.net//wink.gifOK OK Messy work benches,messy shop areas. Ganoskin which is a jewelers site has the bench exchange,where the folks show their work area. It is interesting to view a place where; things are done,both creatively and commerically. Just as a picture shows more than written text.A picture or pictures shows a little bit of each other. Now I know some folks don't want to show their place and that is fine, privacy, a little bit shy or a whole lot shy! We don't invite everyone into our work place,we reserve that invite to special folks we know.But every one think about it. Now don't clean up for company, just clean up for yourself,or in my case myself,because we will be able to find things long hidden or taken by the little people who hid our things.There are people who are neat and others who have paths in their shops and can of know were things are suppose to be,but aren't.I am poking fun; but mostly at myself,the shop is a mess,mostly because of rewiring, at least that is my rational.
Dick Stack-Hillsdale Art Metal


Paul Gauthier
08-03-2004, 05:39 PM
Lookin at your grass that mower should last forever.

Paul G.

[This message has been edited by Paul Gauthier (edited 08-03-2004).]

08-03-2004, 07:33 PM

I neglected to answer a couple of your questions. The X travel will be 11.5", the Y will be 8" and the distance from the top of the table to the bottom of a 3/8" endmill in a holder will be 7.5". So far total cost of all material and parts including all electronics, four 280 in/oz steppers, four driver boards, power supplies and hardware is in the neighbourhood of $1500 USD including a computer to operate it. I expect the design to be extremely rigid. I did a calculation of the amount of deflection to be expected on the 1 1/4" round rod ways. If 100 lbs is placed at the center of one of the ways which is supported at each end the expected deflection is around .00007"

About the gear cover, I took off the gear cover some time ago as I find I am always doing something at that end that requires access. Not a big deal, it drops on with no tools.

08-03-2004, 07:49 PM
I went to work on one of my lawn mowers, my pup has pulled the starter rope out of the motor..

The rascal.. then I look and he is under the 4wd truck working on the brake lines..

Evan: looks like your grass would starve a goat.
Did the fire pass you by?


08-03-2004, 10:54 PM

The fire is well away from here and not a threat to us. The dry weather is another story. We have a very arid climate, total precip in our area is only equal to about 15" rain per year and it seems to be getting hotter and drier. The humidity here ranges from 20 to 35% at the most with very occasional increases to around 50%. It is bone dry right now. I decided it might be an idea this last weekend to drain the water from the 40 gallon tank on my air compressor. I haven't done it for a couple of years. Three drops came out.

[This message has been edited by Evan (edited 08-03-2004).]

08-03-2004, 11:15 PM

When you get the machine operational it would be interesting to use a fish scale and a good dial or electronic indicator to measure the actual deflections of the machine to see how closely your calculations predicted the stiffness of the machine in various directions. It is an easy series of measurements to make and very useful for developing a feel for how a particular set up is going to perform. A really good set up for precision machining will have less than 10 microinches per lbf. of compliance. Have you described the spindle here? Sounds like an interesting project. 96 F is an average hot summer day in Texas, probably we will have a few more than you do though.

08-03-2004, 11:31 PM
Well Evan, your mill is about the same size as the harbor freight micro mill that I have that I got for 265$
Could save tons of money going that route, but again, something to be said for one you build yourself, im sure with better tolerances.

08-04-2004, 06:01 PM
what about the RT? Maybe best to finish one project before starting another?

08-04-2004, 06:11 PM
The RT is for the mill. That's why I ordered four steppers and driver boards.

08-04-2004, 06:50 PM
Cool! Keep us abreast of your progress.

08-04-2004, 06:57 PM
I won't be getting very much done at all for the next while. Company is coming....