Back Gear

[Alan]

As per my previous thread, my first venture into thread cutting on my S7 has been a disaster.
I am taking the good advice offered, however i think my speed may be to high.
I have read that the machine should be in "backgear" can anyone advise please on how to engage this facility, should the belt arrangement be altered etc.

Alan

[jasonb]

Im not a myford man but back gear is usually engaged with a lever. On the myford I think that its the lever under the spindle between headstock and chuck. It would also be wise to select the slowest speed via teh pullys as well. Should give you about 30rpm

The backgear will give you a fast & slow speed at the flick of a lever without having to change belts.

Jason

[dickdastardly40]

Alan,

From memory:

Look inside the headstock cover just adjacent to where the chuck screws on, you should see a small lever on the hub of the 60 tooth gear which turns 180 deg to take out the lock and allows that gear to freely rotate.

Under that on the outside there is a lever which has a screw lock which you need to move upwards to engage the backgear and mesh with the 60T, then relock.

If you now rotate the drive you should see the spindle rotate at a lower speed.

Disengagement is a reversal of the above, you need to hand rotate the spindle to get to where the lock engages.

Hope this is clear, try screwcutting at 25 rpm, it will seem so much more tranquil.

Al

[redmog]

Alan - -You need to read this -
www.pilotltd.net/super7.pdf
page 23 I think.

Chris

[Alan]

Thank-you again gentlemen, will try this out tomorrow

Alan

[SteveW]

Guys,

It occurs to add that if you are fiddling with back-gear get used to checking the chuck will rotate (i.e. isn't locked) before hitting the power.

It's just oh so easy to lock the drive by engaging the back gear lay shaft and not disengaging the two ends of the headstock drive.

[Alan]

Got It, easy when you now how !!!

All that remains knows is how to cut correct threads!!

Alan