Making helical gears on a horizontal milling machine
This is really just the same as making helical gears on the vertical milling machine. The full description is to be found::
Only the differences from this are described here.
The key differences are:
Instead of the cutter being on a stub arbor in the vertical socket the cutter is on the horizontal arbor fitted in the horizontal socket.
Since the angle of the cutter is fixed the only way of making the angle between the workpiece and the cutter is by swivelling the table.
One other difference is that the distance between the cutter and the workpiece is done, in vertical mode, by moving the milling table in and out. In horizontal mode it is done by moving the milling table up and/or down.
The workpiece would have been held in a dividing head parallel to the milling table. The teeth would have been cut using a brown and Sharpe type gear cutter held on an horizontal arbor .Doing this means the cutter is directly above the workpiece.
But if the milling table is at right angles to the horizontal arbor the cutter is going to make cuts along the axis of the workpiece. Clearly for a helical gear the cut needs to be made at an angle. The way to do this is the make the table capable of swivelling round to the required angle.
Usually this would be done using some sort of power feed.
To sum up. A purely horizontal machine can only cut helical gears if it has a table that swivels. But, surprisingly, it is perfectly possible to cut helical gear on a vertical milling machine.