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I was afraid you'd tell me that. I knew the tolerance applied to the tooth thickness or space width. I was hoping I could make some sense out of it and use the tools I already have. That doesn't appear to be the case. I get to buy more reference material. Thank you.

I've been working with ISO tolerances for a while and have been puzzled by this. Are the classes used for splines the same as for general holes and shafts even though the nomenclature is reversed? A typical call out for a shaft could be 150f8. However the tolerance on a spline shaft would be...

Thank you all for your help. We would much rather increase the power to the screw than redesign the screw so it performs at a substandard rate.

I have some of your answers, electrageek. Does this tell you any more? The original screw turned 85 rpm (1317 at the motor) with motor amps recorded as 480. (The rated arm. amps from the motor's tag is 473.) The new screw turns 65 rpm (1007 at the motor) with the motor amps recorded as 470. I...

Thanks for the vote of assurance. I guess I'm having trouble determining what the limiting condition is - Torque or horsepower? I'm thinking about the power at the screw (output). It takes a certain torque to turn the screw this speed. This torque at this speed determines the horsepower out...

We have a situation with a plastic processing extruder where we have changed the screw design for more output and the maximum speed is now limited to 65 rpm. The old screw would turn about 85 rpm. The drive motor is a 300 Hp DC working through a 15.49:1 reducer. With 1750 rpm at the motor we...

Hello MoMiner, I'll start by sending you to the same place I was sent with my question - the manufacturer. The manufacturer of your cable may have some recommendations. My first thought is the 4" pulley seems small for a 3/8" cable if it will be used frequently. Cable hoists use much larger...

We have a possible project of converting a machine with a reducer (gear box) being driven directly by a motor through a shaft coupling. The conversion would move the motor off the centerline of the input shaft and add pulleys and belts to reduce the speed of the reducer's input shaft while...

That's an interesting solution. But, yuk. Drawing with the snap to grid on is annoying. I feel boxed in. I'd like to watch one of you do that to see how you overcome some of the issues I see. You say "Set your snap to 10/254 or .03937007 to draw in mm." and "draw everything full scale." How do...

I can't get 'cal to work. Maybe that's because I'm in AutoCADLT 2000. Thanks for all the advice. Some of your suggestions bring up another topic. Am I the only one who needs to draw in both inches and millimeters on the same part? The simplest example might be putting an M24x3.0 thread in the...

It ain't workin' here. Either I'm doing something wrong or it just won't work with my version of AutoCAD. As soon as I enter the space after the / I get the invalid point message. Are you doing this for displacement of a feature being copied or is this a different command? I tried to enter this...

cdi12, How? I tried it exactly as you have it typed and as soon as I type a space after the / I get an invalid point notice. I also get the invalid point notice with 25/25.4. What version of AutoCAD do you work with? My AutoCADLT 2000 won't let me enter fractions with decimals at the command line.

MechEng2005, Wow. It really is that easy. I guess I was trying to get Excel to do what I've been doing in my head not thinking it could reverse the steps. I've been doing the simple multiplication to remove the decimal and then multiplying by 5. Excel can easily make 1023.75/127 a fraction...

HgTX, Do you use AutoCAD? My final drawings for the shop floor are dimensioned in inches. A lot of the parts I redesign and draw were originally metric based designs. When I copy a feature and want to displace it 25mm I use 125/127 as a displacement {(5*25)/127}. That way I can draw in both...

Excel-ent! The fraction is the answer to a formula formated as a fraction, so it wasn't entered as a string. However, using the text function, and a helper cell, it can be converted to a string and then your formula works great. Thank you.

Harley78, Have you tried the sumif function? You might need to use countif with it for the duplicate numbers.

Hello. I use Excel a lot for metric conversions as I draw in both inch and metric in AutoCAD. The problem with AutoCAD comes with using fractions - AutoCAD doesn't like fractions with decimals. Because of this, I use 5/127 or 127/5 for metric conversion instead of 25.4. How can I get Excel to...

You could have been right about another appliance effecting the voltage. I traced the dryer line and found that it feeds into another side of a junction box in the line from the stove back to the fuse box. The way the box is setting, the dryer line is hidden. And about an intermittent open. We...

There shouldn't be anything else on the circuit. Aren't stoves supposed to be wired separately back to the breaker/fuse panel? Also, I traced the wires and, with the exception of an additional panel/switch midway, there doesn't seem to be anything else. I have no idea why the additional...

Let's start by letting you know I'm a mechanical engineer with an electrical question. My stove recently died. One of the elements in the oven arced. However, nothing on the stove works now. After checking the fuse panel and not finding a tripped breaker or blown fuse (I also have part of my...