Allen models Fitchburg Northern build by first timer

Mike Walsh · Post by **Mike Walsh** » Mon Oct 04, 2021 11:24 am

Very cool! Do you have a track nearby?

Just picked up a FN over the weekend that was running on air for a friend. Boiler is brand new.

Would be great to do a FN double-header sometime at a local track

milwiron · Post by **milwiron** » Mon Oct 04, 2021 11:37 am

Nice work Martin!
Yup, I always appreciate when my wife goes and visits our daughter and her family for a day or two. All work on the house stops and my time is spent throwing chips out in the garage.
Denny

mcjustis · Post by **mcjustis** » Mon Oct 04, 2021 2:17 pm

Mike, I live about ten minutes from Indiana Live Steamers. I just joined the club last month. They have a few miles of 7 1/2" gage track and seem to keep growing. I'd love to see some pictures of yours.
Martin

mcjustis · Post by **mcjustis** » Fri Oct 08, 2021 3:14 pm

In my usual way of not keeping any sort of rhyme or reason to the parts I do, I've spent this afternoon working on the steam chests and covers. Luckily enough I was able to use the Kent 2 axis CNC mill for the holes. Made quick work of it.

Martin

: Just putting some holes in the covers.

mcjustis · Post by **mcjustis** » Wed Oct 13, 2021 1:31 pm

I worked on the cams today. I ended up adding a bit of material around the offset hole for the screws to go into. Also ended up putting some flats where the screws will go.

Martin

mcjustis · Post by **mcjustis** » Sun Oct 17, 2021 6:51 pm

I got one cylinder bored today. Now I can get started on the facing and holes for the cylinder. I cut it to 1.3735 and honed it out to 1.3750. Doesn't get much closer than that. Also came out to a very nice finish after honing.
Martin

Bill Shields · Post by **Bill Shields** » Sun Oct 17, 2021 7:36 pm

Extra meat a good idea. I had one crack on me a decade or so ago.

Taking apart for repairs is a real PITA.

Bill Shields · Post by **Bill Shields** » Sun Oct 17, 2021 8:29 pm

As a heads up

I have found it useful to have a line scribed on the eccentric from the center of the bore radial along the offset axis -> On the hub side of the eccentric so that you can see it once eccentrics are assembled

mcjustis · Post by **mcjustis** » Mon Oct 18, 2021 3:41 pm

Bill, it's hard to see in the picture but there are flats at 0, 90, and 180 degrees from the offset axis so i can see where the eccentric is at.

Bill Shields · Post by **Bill Shields** » Mon Oct 18, 2021 8:31 pm

That works... Bad eyes small screen.

Another trick that I use it to drill and tap a hole into which I can screw a pointer.

Hope you are not planning on putting screws at all 4 flats...

mcjustis · Post by **mcjustis** » Wed Oct 20, 2021 7:44 am

There's only three flats. But, I was only planning on using two as per the plans.

Bill Shields · Post by **Bill Shields** » Wed Oct 20, 2021 5:42 pm

The Home Machinist!

Allen models Fitchburg Northern build by first timer

Re: Allen models Fitchburg Northern build by first timer

Re: Allen models Fitchburg Northern build by first timer

Re: Allen models Fitchburg Northern build by first timer

Re: Allen models Fitchburg Northern build by first timer

Re: Allen models Fitchburg Northern build by first timer

Re: Allen models Fitchburg Northern build by first timer

Re: Allen models Fitchburg Northern build by first timer

Re: Allen models Fitchburg Northern build by first timer

Re: Allen models Fitchburg Northern build by first timer

Re: Allen models Fitchburg Northern build by first timer

Re: Allen models Fitchburg Northern build by first timer

Re: Allen models Fitchburg Northern build by first timer