Search found 352 matches

by mklotz
Fri Oct 11, 2019 11:07 am
Forum: Lathes
Topic: Screwcutting not picking up in the same place
Replies: 19
Views: 2967

Re: Screwcutting not picking up in the same place

charkmandler wrote:
Fri Oct 11, 2019 10:12 am
... I will look in to needing different gears for different metric thread pitches.
If you have a 3 mm leadscrew, this chart may be of help...

http://bbs.homeshopmachinist.net/thread ... ost1258773
by mklotz
Sun Aug 25, 2019 9:08 am
Forum: General Discussion
Topic: Looking to build a dividing head
Replies: 6
Views: 1464

Re: Looking to build a dividing head

The hole circles you need on the plates are a function of the dividing head's internal gear ratio. When I wrote the programs available under the DIVHEAD archive on my webpage, I included a program, DPLATES, which can be used to determine which hole circles are required to perform all divisions up to...
by mklotz
Fri Aug 16, 2019 4:36 pm
Forum: Live Steam
Topic: Wood lagging on the Invicta
Replies: 10
Views: 2306

Re: Wood legging on the Invicta

Legging? Isn't the proper term lagging? No, I'm not trying to be the "word cop". Just hoping to either verify the proper term, or prevent the use of improper terms. It's better for all concerned. So then, those who know, please speak up. :wink: According to the dictionary... Legging - a covering fo...
by mklotz
Sun Jul 28, 2019 12:57 pm
Forum: General Discussion
Topic: Winding springs
Replies: 7
Views: 1684

Re: Winding springs

I tried winding a spring using .020 piano wire around a 1/4" mandrel (Sexist term in Ca.). After unwinding, the coil was 1/2" diameter. I wanted 3/8" diameter and a bit stiffer spring. I'm guessing .030 wire would be better, but I don't know what diameter of mandrel to use. The free coil length wil...
by mklotz
Thu Jul 04, 2019 8:56 am
Forum: Live Steam
Topic: 1859 locomotive
Replies: 4
Views: 1755

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: 1755

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: 2579

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: 5172

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: 4385

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: 4183

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: 4183

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: 4183

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...