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DaveH:
--- Quote from: wongster on February 19, 2012, 08:32:16 PM --- The 3/8" slot drill I used from Sherline actually cut 0.372" instead of 0.375".
Regards
Wong
--- End quote ---
Wong,
Well that is just not acceptable, worst I ever heard :(
:beer:
DaveH
wongster:
WillieL/Ralph, the price range is rather big. Veritas' is about $40, Little Machine Shop's almost $70 (up to 0.002"), and Travers' about $83 (up to 0.001"). I now believe in buying one time after the experience with the Height Gage which I just replaced. The Taiwanese gage I have is not that cheap but its about 1/2 the price of the new Mitutoyo 570-312 (made in China though). Don't know which Optical Punch to go for yet. Will have to read more.
DaveH, I'll run some more test with a deeper slot to ease measuring with the caliper to confirm this. One thing I observed during making the initial slot was the slot drill cut better when held in the the endmill holder from Sherline. When I was using the the ER16 collet chuck (with 1MT shank), the surface finish wasn't impressive. Maybe the collet chuck sticks out more to make it less rigid in the micro mill.
I'm hoping for another session in the shop this evening when my wife is away for church meeting till late. Will be thinking of correcting the tapered slot in the Slide and see if I can mill the same width on the Base to match. I'll try, as Norman shared, using the edges at one corner of the workpiece to layout the holes and lines instead of the centre hole.
DaveH:
--- Quote from: wongster on February 20, 2012, 05:47:36 PM ---
DaveH, I'll run some more test with a deeper slot to ease measuring with the caliper to confirm this. One thing I observed during making the initial slot was the slot drill cut better when held in the the endmill holder from Sherline. When I was using the the ER16 collet chuck (with 1MT shank), the surface finish wasn't impressive. Maybe the collet chuck sticks out more to make it less rigid in the micro mill.
--- End quote ---
Wong,
I wouldn't concern yourself with it at the moment, go with what works.
Just to let you know I have a sherline mill and lathe. See my avatar made only on the Sherline's.
:beer:
DaveH
Fergus OMore:
Wong,
By now you should have a couple of poor-ish copies of the little 'centre finder' or sort of D Bit from the other book by George Thomas.
It came from the write up on his Versatile Dividing Head which I made up some years ago. Again, this is a very worthwhile tool to gain more machining experience but to be invaluable for all sorts subsequent worth.
I was musing- it had been a night of nights next door to a Chinese dragon display- and then innumerable courses and a disgusting lot of wine.
We all have problems :coffee: And the coff/tea needs to be stronger but you made an Ian Bradley tool. Did you realise that George Thomas took many of the Bradley 'designs' and improved on them?
Now there is a thought :bow:
Cheers
N
wongster:
Thanks N.
Lunar New Year was towards the last week of January. It went on for 15 days (by tradition) but most of us were back to work on the 3rd day (only first 2 days are public holiday in Singapore). I started work on the 2nd day till 11 pm as I was scheduled on duty at a new property launch. This year was quieter with watered down festive mood in this country.
I'll spend some time reading through all the books and materials, including the 2 jpg's you sent. My understanding should improve as time passes.
Just got home from appointments. Too tired to do anything today in the shop. Will read instead.
Regards,
Wong
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