Search found 1094 matches

by Carrdo
Tue Jul 23, 2019 2:51 pm
Forum: Build Log
Topic: A Real Dirty Job
Replies: 108
Views: 33258

Re: A Real Dirty Job

Not to say that I have had enough "punishment" making the heart shaped links on the Josslin Hudson lead truck but now I am basically going to repeat the process all over again to machine the brake shoes on the Langworthy/Yankee Shop Hudson lead truck. Normally, one would have had castings for these ...
by Carrdo
Tue Jul 23, 2019 1:11 pm
Forum: Build Log
Topic: Constructing The Josslin NYC Hudson Lead Truck
Replies: 44
Views: 8781

Re: Constructing The Josslin NYC Hudson Lead Truck

Finishing the link's external profile. In the end I couldn't use the small fly cutter shown previously as the radius of the scallop cut was so small (1/2"), the corners of the fly cutter body fouled the workpiece. Switch tactics. The perfect cutting tool for this operation turned out to be a 1" dia....
by Carrdo
Sun Jul 21, 2019 11:18 pm
Forum: Build Log
Topic: Constructing The Josslin NYC Hudson Lead Truck
Replies: 44
Views: 8781

Re: Constructing The Josslin NYC Hudson Lead Truck

Completing the external profile on the links. What to do when you have lost all of the previous holding surfaces through the profile machining operations? Create another holding fixture! I still (deliberately) have a vertical centre line scribed on each link and the holding fixture was also made wit...
by Carrdo
Sat Jul 20, 2019 11:24 am
Forum: Build Log
Topic: Constructing The Josslin NYC Hudson Lead Truck
Replies: 44
Views: 8781

Re: Constructing The Josslin NYC Hudson Lead Truck

Further work on the heart shaped links, this time on the external profile. I always ink and scribe the external profile first as it involves 4 intersecting arcs. Just to be sure that the link external profile is correct as there is not enough information on the drawing as is without making additiona...
by Carrdo
Tue Jul 16, 2019 5:07 pm
Forum: Live Steam
Topic: A Little Machining Problem
Replies: 7
Views: 650

A Little Machining Problem

Hi Folks, As you know, I like to build (Hudson) locomotives but I need your machining expertise. Does anyone have a practical way of attaching a smokebox shell to a cylinder saddle so that the bolt holes align completely? These holes have to be drilled radially and I have a way of marking and drilli...
by Carrdo
Tue Jul 16, 2019 1:37 pm
Forum: Build Log
Topic: Constructing The Josslin NYC Hudson Lead Truck
Replies: 44
Views: 8781

Re: Constructing The Josslin NYC Hudson Lead Truck

The heart shaped links internal side slots finished machined. This was a real machining nightmare. As careful as I was, I messed up two link blanks getting there. There is a lot more to the layout and the setup related to the machining than what I am showing. I did make extensive additional hand wri...
by Carrdo
Fri Jul 12, 2019 4:03 pm
Forum: Build Log
Topic: Constructing The Josslin NYC Hudson Lead Truck
Replies: 44
Views: 8781

Re: Constructing The Josslin NYC Hudson Lead Truck

Machining the internal heart shape on the heart shape links. This time I tried something different - to actually generate the curves rather than approximating them as previously described by chain drilling and then by die filing. To do this one has to use the rotary table again. This is probably the...
by Carrdo
Tue Jul 09, 2019 2:01 pm
Forum: Build Log
Topic: Constructing The Josslin NYC Hudson Lead Truck
Replies: 44
Views: 8781

Re: Constructing The Josslin NYC Hudson Lead Truck

I guess that I should trust my mill's micrometer dials when spacing holes over a very short distance as Harold says. Just remember to move in the same direction used for taking out any backlash in both the table and the mill's cross slide. After locating and drilling all of the holes in the heart sh...
by Carrdo
Wed Jul 03, 2019 11:04 pm
Forum: Build Log
Topic: Constructing The Josslin NYC Hudson Lead Truck
Replies: 44
Views: 8781

Re: Constructing The Josslin NYC Hudson Lead Truck

OK Harold, I'm game if you care to explain further for all of us.
by Carrdo
Wed Jul 03, 2019 9:05 am
Forum: Build Log
Topic: Constructing The Josslin NYC Hudson Lead Truck
Replies: 44
Views: 8781

Re: Constructing The Josslin NYC Hudson Lead Truck

(bad) habits? I don't necessarily trust my micrometer dials as I think there is some variable wear in the mill's feed screws. Richard keeps telling me to go digital but I can't afford it at the moment. As to repeatability. the heart shaped link hanger pins in the truck cross frame members are not al...
by Carrdo
Tue Jul 02, 2019 8:44 pm
Forum: General Discussion
Topic: Machining Setup's with Few Comments
Replies: 75
Views: 21626

Re: Machining Setup's with Few Comments

Optical centre punching - the good, the bad and the ugly. This is for those who do not have digital equipment. What you need - good eyesight, very good lighting and a very steady hand. If any one of the foregoing is a problem, optical centre punching is not for you. What can you achieve? If you are ...
by Carrdo
Tue Jul 02, 2019 7:39 pm
Forum: Build Log
Topic: Constructing The Josslin NYC Hudson Lead Truck
Replies: 44
Views: 8781

Re: Constructing The Josslin NYC Hudson Lead Truck

Starting work on the lead truck four heart shaped links. Since I often do things the most difficult way, here is another example of that. Those having digital equipment would do a job like this in 5 minutes but... There are three central holes around which the heart shaped links are constructed. The...