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No offense taken John. I feel that open discussion of differing opinions is one of the best ways for all of us to learn. I have used O-rings quite successfully on engines with larger bores of 3/4 inch and up. But, for the 3/8 inch bore engines that I have been building for the last 10 years or...

The rules for selling on HMEM are in the BUY/SELL'TRADE forum at: https://www.homemodelenginemachinist.com/threads/f-s-guidelines.14436/ As long as this is an incidental sale (ie not part of a business) and you are an active member of HMEM it will be OK however a posting in the INTRODUCTION...

George and Steve both make good points and both are very accomplished builders of small IC engines. From an engineering standpoint there are three main types of things to consider when scaling down. First there are things that do not change. Atmospheric pressure, compression ratio and voltage...

BUMP: Bumped to get this post into the new posts listing. It never appeared there because of a forum error. HMEM Administrator

I think that the confusion comes from the gear diameters specified is the OD of the , gear. The pitch diameter, where the teeth touch is different. The OD of a gear is equal to (N+2) / DP and the Pitch diameter is equal to N X the DP, where N is the number of teeth and DP is the diametrical...

I have made many plugs using Corian and it works fine but is quite brittle. Also it is difficult to find in some overseas countries. I went searching for a replacement material and fount that pulltruded fiberglass epoxy rod has slightly better high voltage insulating qualities and better heat...

Looks like a good solution to your floor space problem. As an addition to make it even more convenient to use I will suggest that you add a remote wireless on/off switch at the nozzle. I did this about 10 years ago and it really makes life easier. Here is a link to the thread I did on it...

OK. We have a part and need to locate it in the mill by "picking up" (locating the center) of a hole. If the hole is 1/8 inch (3mm) or larger it is no problem using a DTI, but when the hole is too small for this it starts to become e problem. In the past I have used a wiggler and centered it...

Current plan is for 3 wide viewing angle white LEDs mounted close to the index mark. This is so a least one of the numbers on the dial will be illuminated at any time. I will mold the LEDs in a filled epoxy that contours to match the area near the dial and then mount it with double stick carpet...

1144 is also available as TGP (Turned Ground Polished) for use in Swiss style CNC lathes. It costs more of course but can save considerable time when making some parts as the OD is accurate enough for bearing fits with out any additional work. Gail in NM

One additional photo I forgot to post. I engraved label strips with both fractional and decimal sizes to go on all the standard size collet hholes. Gail in NM

I bought an ACRA toolroom lathe almost 20 years ago. The ACRA is a very accurate copy of a Hardinge HLV. If the Hardrige had a 10-32 hole tapped in the ACRA has one there also. It is made by Cyclematic in Taiwan. This means that all Hardinge accessories are bolt on so additional tooling is...

DJP, I don't think that an audible signal would improve things a lot for me. I can't think of a way that it could be bidirectional with any real degree of precision. Also, with my touch screw I know quickly which direction is the shortest way to zero and an audible might slow the operation...

A knob was made up out of 1-1/8 diameter steel 12 inch thick. The knob wants to be made of a heavy material so it will rotate about 3 turns when flicked with a finger after being loosened. The recess around the screw positions the knob so there is about 1/32 inch of play in the crank position...

This mod won't improve the precision of a Bridgeport milling machine, but it does eliminate two sources of irritation of operation. Over the last 35 years that I have had my BP I have probably knocked the crank off its axle al least 500 times necessitating picking it up from the floor. The...

First off to set the stage, I started having vision problems about 20 years ago , Today I have been legally blind for about a year and a half. This means that to see any detail I need lots of light, and magnification. I have lots of overhead light and various magnification items. But on the...

Also check the threaded hole in the head for any possible burr caused by the tapping operation. It's a good idea to countersink the thread SLIGHTLY to remmove any possibility of a burr being formed when tightening the plug. Gail in NM

If using a copper washer it should be at least 1.5mm and preferably close to 2mm thick. The washer supplies with NGK CM-6 plugs measures about1.9mm thick when new. If the plug has been tightened up a few times on the washer then the washer should be removed and annealed by heating to read heat...

In the USA they are in quite common usage as nuts for Switchcraft products such as charging jacks and mounting nuts for mounting nuts for small toggle switches from many manufactures. Here is an eBay listing for replacement plated brass nuts...

Gary, Welcome to HMEM. The best forum for your questions would be: General Engine Discussion. You will get the best results if you make the title as specific such as "Oldboatguys beam engine question" as this gets members attention who are familiar with what may be looking for. Don't worry...