Search found 348 matches

by mklotz
Thu Jul 04, 2019 8:56 am
Forum: Live Steam
Topic: 1859 locomotive
Replies: 4
Views: 589

Re: 1859 locomotive

Glenn,

Could you please give me the Wikipedia URL so I can pass that information along to the folks at HMT where I saw this picture?
by mklotz
Tue Jul 02, 2019 9:26 am
Forum: Live Steam
Topic: 1859 locomotive
Replies: 4
Views: 589

1859 locomotive

I'm not a railroad afficionado (though I have built some live steam stationary engines) but I saw this photo on another forum and thought you folks might enjoy seeing it... https://s3-us-west-1.amazonaws.com/hmt-forum/egyptian_viceroy_steam_locomotive.jpg Full size image here... https://s3-us-west-1...
by mklotz
Tue May 14, 2019 12:23 pm
Forum: General Discussion
Topic: Hyperboloid of revolution twirler
Replies: 11
Views: 1588

Re: Hyperboloid of revolution twirler

The Cartesian equation of a hyperboloid is: (x^2 + y^2)/a^2 - z^2/b^2 = 1 With the origin set at the center of the figure, define the x direction to be left/right and the z direction up/down. The y direction is then perpendicular to the board. To obtain the equation of the cuts in the board, take y ...
by mklotz
Wed May 01, 2019 8:56 am
Forum: The Junk Drawer
Topic: Today's Discovery: Wire Gauge Drill Bits for Carbs
Replies: 16
Views: 2166

Re: Today's Discovery: Wire Gauge Drill Bits for Carbs

The one thing I wish I had is an index. I have to use calipers to figure out which drill bit is which. Huot sells an index... https://www.amazon.com/Huot-10400-Drill-Index-Gauge/dp/B00018A1Y6/ref=sr_1_4?crid=2NV175XHLM44K&keywords=drill+index+61-80&qid=1556718605&s=gateway&sprefix=61+80+drill+index...
by mklotz
Wed Apr 10, 2019 3:59 pm
Forum: General Discussion
Topic: Measuring a diameter without a caliper
Replies: 19
Views: 2974

Re: Measuring a diameter without a caliper

Sorry, wrong link https://sciencing.com/radius-circle-chord-5929711.html Or you could just give him the formula r = (c^2 + 4 * s^2)/(8*s) where: c= chord length s = sagitta (perpendicular distance from chord to circumference) = jaw length from tip to inner surface of caliper beam r = radius of circ...
by mklotz
Wed Apr 10, 2019 8:59 am
Forum: General Discussion
Topic: Reading rotary table????
Replies: 18
Views: 2809

Re: Reading rotary table????

Marv, I understand it doesn't work to the exact minute/second but it's so close it's not going to effect the balance of what ever the OP is trying to do. No, depending on the number of divisions, you can be off by as much as a degree or more. For a one degree error on a bolt circle with a 4" radius...
by mklotz
Tue Apr 09, 2019 3:41 pm
Forum: General Discussion
Topic: Reading rotary table????
Replies: 18
Views: 2809

Re: Reading rotary table????

There is no easier way to use a RT than understanding how to calculate the hand wheel rotation following the process outlined by Marv. To expand on Marv procedure... at the end one has to crank the handle a certain number of Whole turns Plus a Fraction of a Turn Like for example 4+3/37 4 turns is e...
by mklotz
Tue Apr 09, 2019 2:46 pm
Forum: General Discussion
Topic: Reading rotary table????
Replies: 18
Views: 2809

Re: Reading rotary table????

Don't bother counting revolutions. Just remember any even number around the table will land on either a "0" or "2" on the dial. Hmm, I don't think so. Let's look at 24 divisions. 360 / 24 = 15 says we have to move 15 degrees between each location. At 4 degrees per revolution, that's 3 and 3/4 revol...
by mklotz
Tue Apr 09, 2019 12:43 pm
Forum: General Discussion
Topic: Reading rotary table????
Replies: 18
Views: 2809

Re: Reading rotary table????

"So, if I am trying to lay out a 4-bolt circle, starting from zero, I advance 4 revolutions of the handwheel (88 degrees) PLUS 2 minor divisions (1 dgree each) for a total of 90 degrees." 4 revolutions of the handwheel = 4 * 4 deg/revolution = 16 deg. You meant 22 revolutions. For N holes in the bol...
by mklotz
Tue Apr 09, 2019 9:12 am
Forum: General Discussion
Topic: Measuring a diameter without a caliper
Replies: 19
Views: 2974

Re: Measuring a diameter without a caliper

I've read that one can obtain accuracies of thousandths with a pi tape. They're expensive to buy so try to borrow one if possible. Alternatively, measure circumference with accurate linear tape measure (commercial or homemade) and divide by pi = 3.14159265...
by mklotz
Fri Mar 29, 2019 11:13 am
Forum: The Junk Drawer
Topic: SS is toxic in California
Replies: 25
Views: 5044

Re: SS is toxic in California

According to California, coffee causes cancer. Seriously, read this fascinating critique of Cal's over-the-top labeling of everything in sight...

https://www.popsci.com/california-coffee-cancer-warning

to fully appreciate just how idiotic the morons who run this state can be.
by mklotz
Thu Mar 28, 2019 2:59 pm
Forum: The Junk Drawer
Topic: SS is toxic in California
Replies: 25
Views: 5044

Re: SS is toxic in California

SteveM wrote:
Thu Mar 28, 2019 12:54 pm
I'm always tempted to add:
"Living in California is harmful to your sanity"
Though not as harmful as living in New England. Been there, done that.