Gallery, Projects and General > Project Logs
Modifying a Southbend Headstock for Indexing
Bernd:
--- Quote from: Divided he ad on February 28, 2009, 11:47:44 PM ---
Now then Bernd, my questions are ....
Are you going to use the mill for the smaller bore, or the lathe? I would think the work would stick out quite far on the lathe?
And how are you going to round the ends off ?
...... Oh the suspence!! :bugeye:
:)
Looking forward to seeing the next bit :thumbup:
Ralph.
--- End quote ---
Ralph,
I'm going to use the lathe. The holes are in about the middle of the part. I would have used the mill but do not have a boring head available at the moment. That's why the lathe is being used.
I have been thinking how I'm going to round the ends. First will be to cut off all the excess material and them some kind of rounding fixture. It will need to be done by hand since I don't have a rotary table yet.
Hopefuly I'll have the smaller hole done this afternoon. If I do pics will be here Monday moring for your veiwing pleasure. :lol:
Bernd
Bernd:
--- Quote from: SPiN Racing on March 01, 2009, 07:04:00 AM ---Very cool.. I see how it will fit.. but will watch this area to see what it does.. LOL
And OMG that chunk of metal spinning like that makes me nervous just seeing the picture!!
Scott
--- End quote ---
Scott,
As I said the rpm on the part isn't as fast as it looks. You know yourself that when a picture is taken as a car goes by that the time the shutter is set to would make a car doing 20mph look like it's doing 100mph. Same effect here. Had I donr the picture with a flash you would have though that I had stopped the lathe.
Three clamps hold the part in place. I made sure thay were down as tight as I could get them with out stripping the threads. Also when I do something like this I jog the lathe up to speed for two reasons, one as has been mentioned, to make sure the piece dosen't come fly out of the chuck and second to see how well balanced the machine is going to run. So all precaustions are looked into before cutting commences.
Bernd
Bernd:
Well I bored out the second hole. But ran into a problem. I'll describe when I get to that part.
First pic shows that I lined up the other side same as the first hole.
Clearance was a bit tight on second boring. I had a bout 1/4" between the part and the saddle.
So I bored the hole.
Then I tried to see if the bar would fit. WOW, it fit alright. I could have thrown it into the bore from across the room. Note the space at about 2:00 o'clock? Yup I had over bored the hole. Now what?
Well, after several cases of beer. I came up with the idea of a plug. I bored the hole out to 1.000" (25.4mm) and made a plug with an OD the same size as the bore. I also put a lead on the plug which is about .005" (.12mm) step. This helps to determine how close you are to the specified dia.
I then Loctited the plug in.
I then turned down the OD to .740" (18.8mm) dia. As I start boring out the hole that turned down part will break off at close to the ID of the bore.
And here you can see that part has broken off, telling me I'm close to the ID of .75" (19mm)
And there you have it. The proper ID. The bar fits with a nice tight fit.
I then used the boring bar to turn down the part of the bushing sticking out. Note the four clamps holding the part.
Here is the clamp mounted on the index head. I just need to clean up the bushing on both sides and then it's on to finishing up the cotter clamp.
Well that's it for now.
Bernd
SPiN Racing:
:clap:
EXCELLENT!
Nice recovery... (more notes)
bogstandard:
Very nice rescue Bernd.
If it can be fixed, it was never wrong in the first place.
John
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