Threading Problems (cont)

[piniongear]

This may be a bit ugly. The angle shown figures out to approx. 28.6. (My protractors are hiding so I did a little trig.)

That result is only one degree from where the carriage should sit (29.5°) so I will asume that there is 1 degree of error using a photo and straight edges. In other words I believe Jerry has the carriage positioned correctly.
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[adamsgt]

Threading gear changes

Here's the chart the purports to show the gear arrangement for inch threads.



This is all I have to go on as regards setting up the threading gears. There is no discussion at all at any other part of the manual. I am assuming (dangerous) that when a gear represented by a circle is tangent to another circle that there is gear engagement.

So, the way I read this diagram is that gear 32 drives gear 64 which causes gear 21 to drive the outer gear of the double gear that then drives gear 42. This is for the configuration which enables threads from 16 tpi on up. It took me a bit to figure out how to actually implement this configuration. But after moving things around including shaft spacers I think i have this configuration set up. Just would like some confirmation if I'm reading this diagram correctly.

When I was cutting threads gear 42 was connected to the smaller gear of the double gear. That could account for the problems. Also had an issue whith the adjustment bracket that holds the double gear. It was hitting the back of gear 64 and I had to use an angle grinder to increase the clearance on it.

 

[tasy_ted]

Set your quick change box to cut a 16 tpi. Turn the chuck enough so you can kick the half nut in. Then, mount a long travel indicator on the bed and place the stylus against the carriage. Move the chuck clockwise so all slack is out, zero indicator. Rotate the chuck exactly one turn. (you might have to mount a pointer), The carriage should move exactly .0625 inch.

Change to 18 tpi, and it should read exactly .0555. If it does not, then something is amiss in the gear train. .........jackie

hi all
this is the quickest and best test put forward so far nice one jackie


regards tasy ted

 

[David Sengelaub]

It looks like the cross feed is set correctly, but the Aloris tool post isn't. If your using a standard style tool I think the tool post has to be turned so the front of it is parallel with the bed.

 

[adamsgt]

It looks like the cross feed is set correctly, but the Aloris tool post isn't. If your using a standard style tool I think the tool post has to be turned so the front of it is parallel with the bed.

I rotated the tool post so it wouldn't obscure the side on the compound for Boyd to measure.

 

[piniongear]

It looks like the cross feed is set correctly, but the Aloris tool post isn't. If your using a standard style tool I think the tool post has to be turned so the front of it is parallel with the bed.

You are talking about this?.........

Jerry has turned threads before and I believe he has this set.
pg