Thread: Douglas Shaper Vertical Feed Repairs

Eric,

The gear has to be precisely located in relation to the pinned on collars or sleeves. The vertical screw's collar is close to the gear and readily measurable. The horizontal screw's collar is a much greater distance and may present some difficulty in establishing an accurate measurement. These existing dimensions mean little if new gears that may have some manufacturing variation are installed.

Get out a file like I did.

Log's plan of attack would be the way I would tackle the job of drilling an aligning hole.

BT

Originally Posted by Log

Drilling new gear to suit shaft, bit of fiddling around but is pretty simple really. You'll need a twist drill or pin(make if necessary) that is a neat fit in the shaft hole. Another straight pin say 6mm to 8mm or so in diameter and with a 60 degree point on the business end to hold in a drill chuck in mill. Hopefully the chuck runs pretty true.

Hold shaft horizontal in vice with required end sticking out from vice, put pin in , now adjust shaft in vice until pin sticking up out of shaft say 50mm or so is pretty vertical. Now adjust table to bring pin in chuck up close to other pin on one side, now do fine adjustment of shaft until both pins are parallel, bring them closer together as you get it better. Do likewise on the side 90 degrees to 1st side. Double check it all again, when satisfied that both pins are parallel on sides of pin then remove pin from shaft.

Now adjust table to set hole up in alignment with spindle axis using the point of the pin in the chuck. Change to required drill now and check if it enters hole without pushing sideways, do minor adjustment until satisfied that drill is entering hole cleanly. Now lock the table in position, recheck if necessary. Of course there are other ways to align hole with spindle.

Now slip gear on to shaft to required position and it's in it's correct position for drilling.
For holding the gear in place for drilling a bit of super glue can be used, about 4 drops around just at the last bit as you push gear on should be plenty. A hose clamp can first be put on shaft to limit gear so it goes on to the required position, this way the gear can be pushed on quickly to a stop, you don't want to be mucking around once you go onto the superglue. Alternately you could drill and tap for a small grub screw in the gear and use this to hold gear in place for the drilling operation. Of course there are other ways to hold gear in position.

Now use a small centre drill to start the hole and progress from there. If badly off centre you may have to put a small slot drill in the chuck and spot a flat surface so you can start the centre drill without it being pushed around the curve. Or just file a small flat there with a small file.

If you want or is necessary you could drill a hole that is slightly larger than the original.
I have drills in 0.1mm increments; in the smaller sizes 0.1 increment drills aren't expensive.

Sorry, it's hard to explain in a few words, job doesn't take too much doing though.

Cheers.

If I'm not right, then I'm wrong, I'll just go bend some more bananas.

Log
Thanks for the very good & detailed description.
I liked the ideas of the hose clamp,the superglue & the slot drill for formimg a flat on the round.
Handy ideas, & I will use these when next fitting gears or whatever to a round shaft.
regards
Bruce

Hi,
Whenever i need to line a hole up as Log suggested in his description, i just use on drill or pin in the chuck and the job, as long as you make sure the drill/pin is not flexing in either axis the hole will be aligned.

Ewan

Originally Posted by Anorak Bob

Eric,

The gear has to be precisely located in relation to the pinned on collars or sleeves. The vertical screw's collar is close to the gear and readily measurable. The horizontal screw's collar is a much greater distance and may present some difficulty in establishing an accurate measurement. These existing dimensions mean little if new gears that may have some manufacturing variation are installed.

Get out a file like I did.

Log's plan of attack would be the way I would tackle the job of drilling an aligning hole.

BT

Bob,

If i take that route it won't take long enough Probably I will do it as a first pass.