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I did this thread about 3 years ago. https://www.homemodelenginemachinist.com/threads/ignition-boot-molding.14539/ Gail

Jim, Glad you are enjoying the VR1A. I designed the VR1A a little over 40 years ago and produced it for sale for about 20 years. I turned the manufacture and sales of it and other kits over to my son in 2000. He produced and sold the line of kits until 2022 when he ceased production and sales as...

Thanks Greentwin. I corrected the link. It points to the first post in the thread. The link you posted picks up a little later in the thread. Either will work now. Gail

While not injection molding, this how to post on transfer molding of spark plug boots using silicon putty might give you a possible alternative: http://www.homemodelenginemachinist.com/threads/ignition-boot-molding.14539/ Gail in NM

We had a nice discussion on cutting bevel gears about a dozen years aghttps://www.homemodelenginemachinist.com/threads/new-guy-from-wis.35856/#post-406954o. If one is interested the thread is well worth reading. Here is a link to the thread...

Train scaling can be a huge and confusing topic but in model engineering we usually refer to the width of the track that is being used. The actual scale of the locomotive is then usually scaled to some rationa number that is near to the ratio of this width to the width of the full scale track...

Think about clamping on the corners of the part. If your 4 jaw chuck almost makes it on the flats it may be able to clamp on the corners. You can also make a split sleeve that clamps on the corners by drilling a hhole is a short length,1/2-3/4 inch, of say 5/16 of3/8 diameter metal. The hole...

Welcome Dave. Your EVIC was a terrific project. I followed along with it with interest when you first published it . Your expertise is a welcome addition to the forum. Gail

About 10 years ago Brian Rupnow and I each built a single cylinder 2 piston engine based on the Commer geometry but with spark ignition. His was 3/4 inch bore and mine was 3/8 inch bore. Fun project and fun to watch. Here is a video of mine. Gail in NM

Great workman ship and beautiful finished model. Gail

I cut many 1000's of gasket paper gaskets out of 0.008 gasket stock for steam engine kits that I sold for about 25 years. Also cut many out of 0.015 and 0.032 stock for personal use. I also cut a lot of gaskets out of PTFE from 00.005 to 0.025 stock. Many people are afraid to laser cut PTFE...

Gedeon, Very nice, I have built 10 Gauge 1 IC powered locomotives so I know what a challlenge they can be. Your switcher is more elaborate than any of mine and very well done. All of my locomotives were powered by shop built 0.9 ccm hit and miss spark ignition petrol engines. The last two were...

I did something similar about 15 years ago for a couple of1.6 cc engines I built.. I used PTFE,, about 0.004 or 0.005 thick as I recall. I cut them out using a laser engraver and did several different thicknesses and all worked fine. The PTFE sheet I had was on a roll so had a slight curve in...

Any more political discussion in this thread will be either edited or oeleted.

Andrew, Great build. I have a soft spot for the Mills as I flew on in a single channel escapement controlled radio control model in the late 1950's so it brings back memories. I have also split cast iron stock in a manner similar to what you did. While I don't think it will affect your part...

I can't tell from the photos, but is the top of your fuel tank below the carb? If it is above as soon as the engine tries to start it will go way too rich to run and lead to fuel dripping out of the carb. Gail

If you don't already have it, you should download the index to SIC. It makes a valuable addition to you you set of SIC. It is available from many places on the internet. One is: Gail

If anyone is interested in molding your one boots, I did a tutorial on building and using a mold about a dozen years ago. It is at: https://www.homemodelenginemachinist.com/threads/ignition-boot-molding.14539/ Gail

Johnny, Welcome to the HMEM forum. I am sure that you will fit in here nicely as in addition to your great clock making skills you have many other varied interests. Your intro caught my eye for two reasons. First, model engineers in NM are a rare breed, and second you have a DYNA machine. I am...

Gary, Your feeds a DOC are mulch too high for a 0.1 mm tip diameter engraving tool. I use the same type of cutter quite a bit, but mostly with a 0.2 mm tip diameter and for engraving printed circuit boards, but I have engraved aluminum on rare occasions. I have engraved a few very small PCBs...