Electronics > Mechanical & Automation Engineering

Change gear table meaning

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Detzi:
Hey there i have a really small lathe witch came with change gears and this chart: (See attachment) . Say i want to cut 0.5mm threads, does someone know what the right configuration of gears for that would be? What do the blank spots mean, what the "H"'s and what do the vertical "connector"-lines suggest?
Thanks in advance
Detzi

jpanhalt:
You have to show the picture on the right so we can tell which pulleys are which. The black vertical line may indicate a connecting V-belt.

Alternatively, do you have a link to the manual or model number?

EDIT: Sorry about the misinformation.  My mind was immersed in routing a perfboard, so everything was 90° to normal.  Yes, I know threading is done with gears to the spindle and not belts. 

Benta:
The pulleys on the right are irrelevant. They're just for spindle speed adjustment.

The "H" just means a spacer, either one supplied with the lathe, or a small gear wheel that can be used as spacer without being active.

This should be depicted on the top of your chart, which we can't see.

Open the left side of your lathe to show the gear wheel arrangement (picture), then we can say more.

Carel:

--- Quote from: Detzi on November 09, 2021, 04:34:04 pm ---Hey there i have a really small lathe witch came with change gears and this chart: (See attachment) . Say i want to cut 0.5mm threads, does someone know what the right configuration of gears for that would be? What do the blank spots mean, what the "H"'s and what do the vertical "connector"-lines suggest?
Thanks in advance
Detzi

--- End quote ---

I have put some numbers through the calculator but they dont add up. I do not see a correlation between for example 1 and 2 mm pitch, it should be half or double. So there is more. But the theory is simple, you want to make a pitch of 0.5 mm.

If the pitch of the thread spindle of your lathe is for example 2 mm, the chuck has to turn 4 times to turn the thread spindle 1 time.
Resulting in a threaded pitch of 0.5 mm.

The table seems to indicate that gears with vertical lines drive each other, if the line switches, the middle gears are connected. The H seems to be a non participating gear, a bush, a dont care.

The gears should all be marked with their number of teeth.

Take a picture of the complete gear train on the left, then it will be clearer.

Detzi:
Thanks so far @all. I made a Picture where all of the drawings is visible as well as two of my Gear train.
@Carel yes the gears are numbered and i did manage to find all of the ones that are needed by the chart. I tried to set them up as suggested by the drawing but the blank spot confuses the heck out of me. So far i'd agree that a H stands for a "hole" (?) and also that the vertical lines indicate "touching" gears. What i dont get yet is as i already wrote what "the blank" field is standing for and how i would connect to it as the vertical line indicates. I thought it might be just misprinted in the wrong spot but i really cant tell.

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