Thank you Bill perhaps once i get more into this hobby and some free cash i will pick up a metric micrometer or 2 all of my instruments are in imperial which is the only reason why im asking for opinions. I have found metric to be easier for drawings myself but due to everything in imperial through my last 3 jobs its hard to tool up on it without a good reason for it.I have been working with the metric system for more than 50 years building and modifying scale models. H-O trains....
The scale is 3.5mm to 1.0 foot. The end result is that I work as easily with the metric system as with imperial. Although imperial is what I grew up with, metric is somewhat easier. The important thing is to "get comfortable" with metric measurement. Most of my construction experience is with imperial. The machine work is maybe 30-70 metric.
A few years ago, I built an electric powered bicycle. The doner(?) was a late model Schwinn, made in China. So all the additions I made were done in metric. With few exceptions, such as I don't have metric keyway broaches. Had to finagle that. A three wheeler arrangement, it worked out well.
A few dimensions to get comforteble with:
25 mm is a fuzz less than an inch (25.4mm=1 inch)
1 mm is 0.03937 inch (roughly 40 thou)
10 mm X 1.5 thread is so close to 3/8-16 TPI you need to measure cose to find the difference.
With little expenditure, you can tool up for metric. A good metric caliper or micrometer along with the conversion factors for imperial leadscrews will yeild good metric measurements. On the other hand, conversion to imperial is just a matter of converting all the measurements, to the above listed factors. The bicycle mentioned was done in metric to make everything one system, no half and half, no two sets of wrenches, et al. My model building is done to imperial, because I must interact with others that have no grasp (nor want) of metric. Go for it, Dude. By whatever system is easiest for you.
Bill, I believe that you meant to say divide by 25.4 to convert mm to inches. I multiply by ,3937 to convert to inche. If a rough calculation is OK, .4 works. I work with both but becuase my measurement tools are Imperial, I convert almost everything to inchesThat makes good sense. For conversion factors, multiply any dimension in millimeters by 25.4. In centimeters, you can multiply by 10 and then convert. For decimeters, by 100 then convert. The result will be in inches. Run out 3 or 4 decimals and round it as fits. Some places it matters, some it doesn't. That's essentially what I do with my models.
As an aside, I picked up a metric micrometer on eBay a while back for 3 or 4 bux. They paid shipping... It took 3 weeks plus to get here and I'm not sure how accurate it is. But I was getting it as a standby tool anyway. If I measure a 12mm shaft at 12.02mm, that's close enough for what I do.
That calculator is indeed sophisticated. I looked at the User Guide. Easy to set for entering Imperial or Metric, but converting is not so easy, it is part of the Conversion menu.I have a machinest calc pro which is very sophisticated that i dont remember the button sequence to figure things out.
Yes, I did I know better! Thank you Tony & Bill for catching it. Muscle memory makes running the conversion almost automatic.RJ......I think you meant multiply by 0.03937 for mm to inch. Left out a zero
In general I like Metric, but I'm pretty well instrumented up for Imperial, plus some machines are cross-dialed, and some have DRO that speaks Metric. Too late in life to start buying a bunch of Metric instruments. Of course, some (the digital stuff) is bilingual.
I have the machinistcalcpro2. On it I enter a number then inch. Then tap mm and it converts the displayed number to metric. Tap inch again and it converts back to inch. Do the reverse to convert to inch. I don't know if your version is the same. I also have a calculated industries conversioncalc plus that does this and many other conversions including torque units.I have a machinest calc pro which is very sophisticated that i dont remember the button sequence to figure things out.