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Author Topic: STAR HEAD PROBLEM  (Read 11820 times)

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askimball (Doc)

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STAR HEAD PROBLEM
« on: March 10, 2011, 11:33:14 pm »
I got involved assembling my #2 Star.....The [no e-mail]@%#$ Head Would Not slide all the way down the column...The Head would ONLY go about Halfway down when it feels like it hits a ridge... >:(
I ended up removing the Key...THAT WAS NOT THE PROBLEM......I noticed in the shaft of the head there is a Spiral looking cut in the head....???????
I've tried another Star Head and it slides ALL THE WAY DOWN...... :)
Apparently STAR didn't do a Final Mill/Cut in/on the Head.....
I'm going to find a wheel brake cylinder hone and see if I can polish it out...or something of that nature...... ::) :P
By the way, does anybody know what size the KEY is..??????
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fc60

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Re: STAR HEAD PROBLEM
« Reply #1 on: March 11, 2011, 11:02:55 am »
Greetings,

Is the head a Star or Phelps?  Or, is the shaft from a Star or Phelps? Phelps tolerances were poor as compared to Star and many parts, while they look the same, do not interchange.

You will not be able to use a brake cylinder hone due to the keyway in the tool head. You will need to visit a machine shop with a proper hone and mandrel for keyway honing.

You may be successful using a brass barrel lap and some lapping paste.

The spiral cut inside the bore is a lubrication pathway.

Cheers,

Dave
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askimball (Doc)

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Re: STAR HEAD PROBLEM
« Reply #2 on: March 11, 2011, 12:44:50 pm »
fc60
It's a Star Machine & a Star Head.......
I tried another Star head and it works perfectly.... :D
All the heads I've seen Don't have that oil groove..... :o
I took the KEY out of the Head thinking it was the problem ??? ??? It wasn't. :P
I understand about the Spiral cut, But, it still could need honing/lapping... :-\
The head slides down approx 2" above the Base, it sounds like it's hitting a ledge ??? ??? ???
I'm not sure I understand about lapping or where to get one ??? ???
Funds are tight, so self repairing will have to suffice... :-[ :-[

Just tried another STAR Head>>>WON'T GO DOWN ALL THE WAY...
I miked the Column Shaft, it varies from:
TOP:: 1.188
1.191
1.196 Middle
1.194 At the base of the Key-way

« Last Edit: March 11, 2011, 02:45:31 pm by askimball »
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Doc - I.Y.A.A.Y.A.S.
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fc60

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Re: STAR HEAD PROBLEM
« Reply #3 on: March 11, 2011, 04:49:05 pm »
Greetings Doc,

Personal Message sent to you regarding a possible fix.

Cheers,

Dave
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askimball (Doc)

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Re: STAR HEAD PROBLEM
« Reply #4 on: March 13, 2011, 02:23:25 pm »
Thanks to fc60 for suggestions for fixing the problem...........
I came up with a solution.....Not going to say, was not to the professional standards you Master machinists would do......
BUT, it did work, and it worked up & down smoothly without any play..........
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