When i took a part the steam chest i observed that all the surfaces within the steam chest are made with a surface grinder. Here fore a change a positive comment to make. ![]() Once all the new bolts are produced i can start to reassemble the steam engine and I'm looking forward to make a new Video showing the difference. Having the right tools in place it is child's play to do that. Common tolerances used in the mechanical industries are not hard to achieve. The 0.02mm are a common tolerance used for such application. In the end i will have in each hinge of the revers mechanism only 0.020mm slop. The new bolts i produce have now a diameter of 2.23mm. With a uniform bigger hole i have now to make new bolts that match the new hole diameter. After resizing all holes they all where with exact the same diameter and at the same time perfect cylindrical. Below a few pictures showing how i reworked the 22 holes. Since i had no choice i had to change my plans and make all the holes in every hinge of the revers mechanism with the larger 2.25mm hole. The therm "Chinese garbage" is very common to here i guess they refer to things like the two reamers i just got. Below a pic of some of the smaller reamers i have in my shop i guess i do not have to mention that I'm not a novice when it comes to reamers. In my lifetime i ordered many reamers and they are usually within 5 micron 1/10 of a hair size accurate. One Mill off does not sound like much but in precision mechanics we measure a bit different. ![]() Going on and measuring the second reamer i got a diameter of 2.24mm. The difference to what i ordered and what i got in the end is 1Mill or one hair size off. Well it turned out that it was not a 2.20mm reamer like i ordered, the test hole i measured was in the end 2.25mm. When i unpacked the two reamers i found no markings for size and therefore i made a test hole and measured it with my pin gauges. It took a long time for the reamer to arrive since in E-bay was just one supplier who hat the desired size for sale. Finally the two 2.20mm Reamer i ordered arrived and i could start reworking all the hinges in that M29 steam engine.
0 Comments
Leave a Reply. |
AuthorWrite something about yourself. No need to be fancy, just an overview. ArchivesCategories |