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| andyf:
I think those are different files, Wong. The ones I referred to are definitely for a collet chuck which bolts on to a 75mm spindle flange. Andy |
| wongster:
Wife was away with her pastor and church friend for dinner. The tension at work today was so great that I promised myself to spend sometime in the shop no matter how short the session is going to be. The session was indeed very short; I only had like half an hour after dinner. I angled the tool away from the workpiece this time and it really cut. The entire edge of the tool was too close the previous time that it rubbed on the workpiece than cut. Genek was quite quick to point this out when my blog post went up the last time. The short section for threading done. Finish not fantastic but it was much better than the previous attempt. In this pic, the tool was set to cut the shoulder. The same method was used to square up the 5/16 die with the stock by pressing it against the live centre on the tailstock. Once I've a few threads going, the tailstock was removed and the thread was finished up by turning the die handle and chuck by hand. Instead of using the cutting oil I normally use for turning and milling steel, some tapping compound recommended by the tool shop I frequent was used. It seemed much easier this time and the threads was done in a flash. I turned the die around and chased the thread but remembered that both side of the die are tapered. The same gap is still there. Why can't it go all the way in? From another angle. Any suggestion? |
| DaveH:
Wong, Although the die seems to cut right up to the face of the die, like you said there is a chamfer to the die. Hence the thread is not cut right up to the shoulder of the work piece. You can "undercut" the thread, which means using something like a parting off tool and reducing the diameter of the threaded part just a 1mm wide or so right next to the shoulder. Reduce the diameter and see if it wll screw on all the way, leave the work piece in the lathe until it fits correctly. Thats one way. :beer: DaveH |
| wongster:
Dave, I tried that the last round and I've to use a plier to screw on the last bit. Maybe I didn't get it right. Read on one site that I should cut it down to the root diameter of the thread? Regards, Wong |
| DaveH:
--- Quote from: wongster on March 22, 2012, 12:06:47 PM ---Dave, I tried that the last round and I've to use a plier to screw on the last bit. Maybe I didn't get it right. Read on one site that I should cut it down to the root diameter of the thread? Regards, Wong --- End quote --- That is correct, then it will screw up to the faces. We all have to do it - you are not special :lol: :lol: :lol: :beer: DaveH |
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