Thread: Hercus Mill Gib Lock
12th May 2011, 11:23 AM #1
Hercus Mill Gib Lock
Rather than hijacking another thread, here is a picture of the Z axis gib locking arrangement on a Hercus Type 0 mill, and the handle I was intending to replace it with. The problem is it's currently 8 mm thread, and the Hercus is 5/16 BSW so I'm now just considering options as to how I'll convert it. The Y axis will be more of a PIA as it's right on top of the Z axis winding mechanism. I may not even be able to get a handle like that shown in there so will need to consider that further.
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12th May 2011, 11:32 AM #2
Unfortunately, there is no photo Pete. Maybe you better stick with the phone
12th May 2011, 11:55 AM #3
12th May 2011, 12:03 PM #4
I'm only seeing the red cross in the white square. Nothing happens when I click on "show picture".
12th May 2011, 01:37 PM #5
Maybe the problem with the photo was mine Pete. The knee on my No.O does not have the additional lock as shown in your photo. I have fitted a Kipp handle in place of the top gib screw. Not the optimum set up. I should modify the knee to incorporate the additional centre lock. I had thought you were talking about the table gibs.
12th May 2011, 01:52 PM #6
This mill has the same arrangement on the Y axis table, and no locking at all on the X axis. I started making up an adaptor to change the thread from metric to imperial, basically a male M8 thread to thread into the handle's nut, with a female 5/16 BSW coming out about 10 mm to screw onto the stud. However I decided the junction where these two threads met would be a weak point, unless I made the whole thing very long, so canned that idea, at least out of brass. Of course in the process I discovered my "excellent quality" Indian 5/16 BSW tap is actually cutting undersize, so there was much "???" until I finally denounced it as a POS tap.
12th May 2011, 02:35 PM #7
Of course in the process I discovered my "excellent quality" Indian 5/16 BSW tap is actually cutting undersize, so there was much "???" until I finally denounced it as a POS tap
At last, a denunciation! As an alternative to your supplier of the sub continental, you might like to try this seller. Quality tooling with inexpensive shipping.
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13th May 2011, 11:17 AM #8
This is how I finished up locking the X and Z axes on the Hercus.
The left handle is to replace a gib adjusting screw. The bolt is threaded 5/16th UNF (as I didn't have a BSF die of that size), with a 5/16 BSW threaded from the other end and stud locker preventing it from unthreading. The handle was milled down as I was trying to get it to fit on the Y axis but simply couldn't squeeze a handle like this in.
The right handle is for the Z axis and is the hex bored out and some brass silver soldered to the end, threaded to 5/16 BSW and powder coated. I tried a few different things here, and if I was going to do it again I'd shorten the whole thing.
The Z axis lock. It looks like the casting has a big gap under the brass but that's just a trick of the camera. I put a washer under it just the same. Brass was used to help prevent damage to the casting, but mainly to piss Bob off as he insisted I use steel. I know this will now annoy him and my job here will be done
The X axis lock. I'm not a big fan of using the gib adjusting screws for this purpose, but there didn't seem to be too many other alternatives.
I'm not sure how I'm going to lock the Y axis. I may need to make up a whole handle to get it to fit. A bit of a PIA so I may come back to that later.
13th May 2011, 11:58 AM #9
I will try not to focus on the usage of brass.
Now that you have that simple task bowled over how about some nice way wipers?
13th May 2011, 02:13 PM #10
PS BTW Bob, yes it was an extremely simple job, and didn't take long at all ... but that doesn't count the time I spent scratching my head trying to get the handle to fit on the Y axis. I'm not one to give up easily, but even I had to admit that regardless of how I configured it, that size handle couldn't be made to fit in the space available. They're not expensive so I will try to squeeze a smaller version in, it would be nice if they were all the same.
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