Gallery, Projects and General > Project Logs
Fixing the how NOT to make an engine
NickG:
John,
Interesting about the accuracy thing. I've always thought a 4 jaw sc would be really handy.
Nick
John Hill:
--- Quote from: bogstandard on July 20, 2009, 09:51:59 AM ---
Thru my experiences, and I don't know if anyone else has found this, but I have found that, from new, my 4 jaw self centring ones have less runout than 3 jaw ones.
Bogs
--- End quote ---
John, perhaps this is logical in that the error is the average of all the errors.
bogstandard:
You just might be right John. It is just a thing I have noticed over the years.
Nick,
As I have said before, I always reach for the 4 jaw SC, my 3 jaw has hardly ever been used. Only when I have a bit of large hex to turn, or some large soft jaw work, does it ever come out. This morning, I am just working with a lump of 1 3/8" brass bar, can you guess what chuck I have on?
I am not saying you should rush out and buy one, but if you do ever get the means available, I think they are a great addition to your arsenal, but don't forget to add the soft jaws as well. In fact, soft jaws for your 3 jaw, if available, are more important that a 4 jaw SC. If used correctly, they can bring precision to your work that you only ever dreamed of being able to do, for such little cost.
John
kellswaterri:
Hello John, speaking of ''soft jaws'' in three and four jaw chucks...I believe that somewhere there is a write up on how to true them up properly before they are put to use...I seem to remember your self may have posted it some where but for the life of me I can not find it...Perhaps some one could post it again.
All the best for now,
John.
NickG:
John,
I don't think soft jaws will be available for my cheap chinese chuck. I did see something in model engineer or model engineer's workshop once though that somebody had made to sort of clamp over the existing jaws then machine them up, not sure how well that would work though? it would have to be a very sturdy setup and you wouldn't get the grip right to the rear of the jaw.
I was thinking making a draw bar for my collet chuck like John Hill did will bring a lot more precision to my work also.
Nick
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