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    1/4 Scale Rider Ericsson

    I had never built a hot air engine, so I consulted some friends especially one who had built many of hot air engines as well as selling castings for them. Page 2 of my document has the changes I used and some of the whys. Here is a link to an article in Gas Engine magazine explaining some of...
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    1/4 Scale Rider Ericsson

    That displacer piston is the opposite, the copper should be on the bottom for max heat transfer, and stainless on the side to minimize heat transfer. Stainless is a poor conductor of heat. If you are daring. I would replace the bottom with copper, about .032. I used type M copper pipe...
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    1/4 Scale Rider Ericsson

    Yes that displacer cylinder made of copper is an issue. A question is the bottom of the displacer cylinder copper? I have some ideas on how to minimize the copper issue. Remember friction is the bane of hot air engines, zero is the goal. The dragging of displacer piston is an issue and must...
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    1/4 Scale Rider Ericsson

    Very nice looking model, if I may ask what is not running for you the way you would like? Bob
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    safety valves

    K2 Here is a picture of the 14” gauge taken around 1987. I co-owned it with friend in the 1980’s, we laid about 1200’ of track at a Threshing show grounds. I sold my share, and since then it was sold in the mid 90’s. It was built in late 40’s early 50’s by a gentleman in Illinois and ran at...
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    safety valves

    K2 You guessed exactly what I was going to propose but really would like to see his application. Wilesco makes a real nice valve that doubles as the filler hole for it largest boiler, a D22. It appears it is set for about 1.5 bar ie about 22psi if I read the picture of the gauge on their site...
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    safety valves

    Mike A photo of the boiler would really help understand what is being attempted. What is the boiler powering? You are describing a water tube boiler with 3 water tubes 3/16" x 5 3/8" long connected to a 1 1/2" tube 8" long. Total volume of the tube is 7.83 oz and volume of the tubes is...
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    Drilling Very Small Holes

    krypto I have those in a PDF, also lots of views of the machine. I will make up a file containing all the info I have and upload it. I have uploaded stuff to vintagemachinery before, Laidlaw Bandsaw and All American Die Filer details and drawings. I never looked for any information on...
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    Drilling Very Small Holes

    I think these were available in the 1950's. I have attached fliers that were in the tool box that was built into the custom cabinet that housed Dumore. Bob
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    Drilling Very Small Holes

    I have a Dumore that is outfitted with x-y table, light, magnifying glass, speed control, depth controlled table that has balance weights so it moves only if dial is turned. It has a magnetic chuck that allows you to center a bit for zero runnout. Smallest it goes down to is a #71 (.026). I...
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    Mideast Model Engineering Show 2021

    Got this from Paul last week
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    Oring for piston in an IC engine

    Rocket Man Not necessarily so, if fitted for the application not using standard o - ring tables. This is my gade showing bounce when new, has run over 600 hours on that o-ring as of last year. Bob
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    Oring for piston in an IC engine

    Here is a quick search for you, just do searches on o-ring, piston etc. lots of information, lots of recent lively discussion https://www.homemodelenginemachinist.com/threads/o-ring-for-piston-ring.32327/ https://www.homemodelenginemachinist.com/threads/the-great-o-ring-discussion.32916/...
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    What to charge to thread a rod

    Just one more thing to consider. If I charge for a machine job I am now a business and my insurance on my shop is cancelled. Lest you say who is going to tell. It does not matter, if I ever made a claim and they find out it is fraud. Not worth it. I have done small jobs like this - they are...
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    Squaring off the bottom of a blind hole

    Just happened by this thread and thought I would share this with everyone. Before I start, this narrative is going to show that we all may just over think some problems. My 18 year old granddaughter (21 now) was building a Stirling engine. She was in the shop making some parts and came over...
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    Martin Models

    Hi Are you saying that ministeam purchased martin models? I went over there and only see the engines that were always on the site. Did not see the Quorn , the Gade cart, or any of the other models he sold. Bob
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    Martin Models

    Hi Tried looking up Martin Models site and it comes back unknown, http://www.martinmodel.com. Anyone know if Gary is still in busyness?? Bob
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    Marklin 4158/91/7 - Oh boy is this cool

    Del Here is my current cleaning project for one of Gen’s sewing machines. It was made in about 1885. I am showing you four pictures of the base. I used the following to get from the before to the after. Soaked in dish soap and water for two days, just a few squirts in the water. Used a...
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    Marklin 4158/91/7 - Oh boy is this cool

    I would recommend the following from your list: Do 1 and 2 first, clean as best you can. Do not pressure test boiler, these were designed to fail. They are for the most part soft soldered together. Most run at less than 30 pounds. Certainly fire it up slowly at some point. Keep pressure...
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    Marklin 4158/91/7 - Oh boy is this cool

    Hi My wife collects steam engine sets like these, Marklin, Bing, etc. She has over 140 of them. Her advice is do not touch it! Take it apart and clean it. No wire brush, no sand paper, or anything abrasive. She also collects old toy sewing machines. I clean these up for her. I am just...
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