Search found 1025 matches

by Carrdo
Sat Dec 29, 2018 10:06 pm
Forum: Live Steam
Topic: Union Pacific Big Boy in 3/4 Inch Scale
Replies: 113
Views: 32524

Re: Union Pacific Big Boy in 3/4 Inch Scale

Ladies and gentlemen, It is a lot more tricky than what Richard is telling you. For example, as one cuts deeper into the part as the 4th axis rotates the part, the ribs will come out tapered (because the rib edges are rotating radially in this case) unless one does some program trickery to reconfigu...
by Carrdo
Fri Dec 28, 2018 10:21 pm
Forum: Build Log
Topic: A Real Dirty Job
Replies: 73
Views: 15464

Re: A Real Dirty Job

Making another fixture I really didn't want to make but.... Every time I turn around there is something new to do. I wanted to press off the existing wheels on the lead truck axles to machine the top of the axleboxes for the ends of the equalizers. I have an arbor press for this and for many other t...
by Carrdo
Fri Dec 21, 2018 4:26 pm
Forum: Build Log
Topic: A Real Dirty Job
Replies: 73
Views: 15464

Re: A Real Dirty Job

Two additional photos.

Everything looks good but I am not out of the woods yet.
by Carrdo
Fri Dec 21, 2018 4:21 pm
Forum: Build Log
Topic: A Real Dirty Job
Replies: 73
Views: 15464

Re: A Real Dirty Job

The swaging operation. The first photo shows how an equalizer end was set up and aligned in the swaging fixture with a piece of masking tape. Crude but effective. There was a scribed layout line on the equalizer located 1/8" beyond the drilled holes in the equalizers for the leaf spring end hangers ...
by Carrdo
Tue Dec 18, 2018 6:33 pm
Forum: Build Log
Topic: A Real Dirty Job
Replies: 73
Views: 15464

Re: A Real Dirty Job

A photo of why the equalizer ends now have to be swaged 1/16" inwards. The leaf spring/hanger arm assembly on the Josslin Hudson is 1/8" wider than on the Langworthy Hudson due to the different design of the leaf spring hanger arms (in both designs, the leaf springs are the same width at 3/8"). This...
by Carrdo
Tue Dec 18, 2018 6:02 pm
Forum: Build Log
Topic: A Real Dirty Job
Replies: 73
Views: 15464

Re: A Real Dirty Job

The equalizer swaging fixture to make the 1/16" offset bends on the ends of each equalizer. It is both simple and tricky at the same time as one has to precisely align each equalizer in the fixture and then reverse the second, opposite equalizer in it to make the opposite bend (also must be precisel...
by Carrdo
Tue Dec 18, 2018 5:34 pm
Forum: Build Log
Topic: A Real Dirty Job
Replies: 73
Views: 15464

Re: A Real Dirty Job

Finishing the equalizer profile. The most difficult operation was fly cutting the equalizer inner radii. As the sweep of the fly cutter was quite large (13/16" radius), the ends of the equalizer bundle had to be set out a long way from each end of the mill vise jaws and had to be independently suppo...
by Carrdo
Mon Dec 17, 2018 11:06 pm
Forum: Build Log
Topic: A Real Dirty Job
Replies: 73
Views: 15464

Re: A Real Dirty Job

Just sailing along.
by Carrdo
Mon Dec 17, 2018 3:12 pm
Forum: Build Log
Topic: A Real Dirty Job
Replies: 73
Views: 15464

Re: A Real Dirty Job

Further along.
by Carrdo
Sat Dec 15, 2018 7:51 pm
Forum: Build Log
Topic: A Real Dirty Job
Replies: 73
Views: 15464

Re: A Real Dirty Job

Machining the new equalizer outlines as a group. Nothing special here; just careful layout, band sawing, drilling and contour milling at this point. The scribed lines can become obscured with edge burrs as one nears the layout line but it is easy enough to remove them, re-ink and re-scribe the layou...
by Carrdo
Thu Dec 13, 2018 6:01 pm
Forum: Build Log
Topic: A Real Dirty Job
Replies: 73
Views: 15464

Re: A Real Dirty Job

After my run in with the hot rolled sheet metal nonsense, the next job was to make a working drawing of the new equalizers. See the first photo. They will be a shade longer than the Langworthy drawings show as with the 1/16" offset on both ends of the equalizers, this has to be compensated for to ha...
by Carrdo
Sat Dec 08, 2018 9:35 pm
Forum: Build Log
Topic: A Real Dirty Job
Replies: 73
Views: 15464

Re: A Real Dirty Job

Sometimes, to move things along when you don't have the necessary equipment for the job, one has to do something rather extreme. Here is a case in point. I had a large piece of hot rolled sheet steel 1/16" thick to use for the new equalizers which was 24" wide by 49" long. It was too large to cut of...