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ive been doing some reading on thread geometry this evening and realized that i have never considered a potentally important detail. ill use a 1/4-20 UNC external thread as an example is the 60° face of the thread supposed to be measured in a plane that is in line with the axis of the bolt, or...

i dont know if this problem is necessarily related to my use of this site or not but every time i look at it my screen eventually gets all static-like and/or blue screens and crashes. this only happens when this site is in the active window. has anyone else had this problem? im running windows...

when i started my build of old boat guys beam engine about a year or so ago i attempted to contact him about the missing pages and he replied about a week ago with the missing pages. i have had several people ask me if i had them and up to this point ive had to tell them to figure it out. but...

Im in the process of figuring out the valve for the traction engine and am trying to figure out how much compression i need if i have about 20.75pounds of reciperating mass(this is an educated guess at this point) and an average piston speed of 3.46fps and a piston area of 15.9 sq.in. how much...

i have seen where several members on here use alibre cad what do you all think of it. im downloading the trial right now. the home page says the standard version is $197 until 12/31 but then on another page it says $999 anyone know whats going on, surely they arent selling it $800 off, i must be...

this is a dumb question but how do you guys get oil through those little spring loaded balls on the machines. i try pumping it in with the oil can with the tip pressed down but im not sure that much is getting in there, any ideas?

im having trouble keeping my endmills in the collets. when i do a heavy cut the endmill gets pulled down out of the collet a bit, sometimes a few thou sometimes 1/4" before i realise it, this has led to more than one good bit of metal going to the scrap pile. i especially notice this on 3/4"...

does anyone happen to know where to buy a 1.5" steel ball in the US? i could use a ball bearing but i need to drill a hole through it and i assume a bearing would be too hard, i could aneel it but id rather just get what i want. any suggestions?

with the start of our new project i figured this would be a good time to show y'all aroud the shop so you could see what were dealing with here. this is from the center, one panoramic wouldnt get it all, 2 only got about 3/4 of it but there is little of interest in the rest, besides a pool...

well boys here is the begining of our next project, the title says it all. this engine is going to be a copy of and engine that my dads uncle, my great uncle, has had for many years. im sorry i dont have a very good picture of the original ill try to remember to get one next time i go over...

this engine has actually been done for a couple months but i just havent got around to posting it. its more or less built to the prints posted on this forum exept 2x print size( some pages are missing ). i havent really made any attempt to clean up the machine marks and probably never will since...

came across the site today while looking for something else, thought it might be interesting. http://steamtraction.farmcollector.com/Steam-Engines/Smallest-Steam-Engine-in-the-WORLD.aspx

this is going to seem like a dumb question to you experianced machinists on the board but what is a horizontal mill most commonly used for? the reason i ask is because the old man and i went to the home of an old machinist about an hour away the other day who had passed away whos family was...

you think this is big enough for the home model shop? my dad bought it last week from an heavy equipment dealer in town. its capacity is 36.5 in and 84in between centers. and it will go down to 6rpm and has a 25hp motor. it was built in nov1941 and was origanally installed in an allis chalmers...

a while back i bought plans and some castings for a 2-6-0, 7 1/2" guage locomotive from railroad supply and have sinse lost intrest in the project in favor of a half scale taction engine. i have all the plans and castings of the drivers, main bearings, and brake hangers. im not sure what to ask...

i am wanting to build a horizontal fire-tube boiler (this will be my first) to power my engines instead of the air compressor and after doing my homework i have got a good idea of what i need to build. the only question that remains concerns the fire tubes, it seems that the most common way to...

first of all i want to be clear in saying im not an expert on the subject but i can tell you what i know from experiance. the only thing that has been done to the lathe that i use (my dads lathe) besides what you have already mentioned is to parallel the headstock to the bed, his was damaged...

i bored the cylinder for the beam engine today and had the same problem as i did when i bored my first engine. the problem is that the boring bar seems to be pulling itself into the metal causing "rings" in the cylinder wall so its very uneven and has an overall poor finish. i think i will be...

what you see here is possibly the worlds crudest operable machine (i built this before i had machine tools to play with) i believe i have all of $3.81 invested in it. its made of scrap iron and a 4-row john deer corn planter. its being powered by my first-built steam/air engine that is also...

i was reding a post that basically claimed that additional work couldnt be gained by alowing compressed air to expand in a cylinder like steam. this doesnt make sense to me because all gases behave in basicaly the same way as far as expansion. the post claimed that as soon as cutoff occured all...