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Shaper tool slot problem.
ieezitin:
John.
I agree with the feed rate. I was playing around yesterday with the toolpost slide action and the table lift action and I got two results. For the life of me I don’t understand why the manufactures did not install as standard mechanical tool feed systems as stock on the machines. I know most including my own makers offered the system as an extra just to squeeze extra mular out of ya but really that’s like selling a lathe without a lead screw.
Anywho I am making progress in getting familiar with the tooling and finishes I am getting, that hot rolled piece was truly a piece of trash even my small mill had a fit trying to mill it.
I was planening some AR500 steel(abrasive resistant Rockwell 500 steel) yesterday and my results were very satisfying indeed the roughing tool I used chattered a bit but the knife point finishing tool done a super job. In fact I was taking .040 cuts with the knife tool and decided to stay with that, I was cutting a slot 4” long x .640 deep x 980 wide which took about 1-1/2 hours, slow I know but fast for me considering I don’t have a full size mill.
Bryan.
I read that full article you linked me. Even though I knew of spring holders I never considered them for my particular problem on the small width slot I need. Through reading of their experiences and findings it makes perfect sense to me of the results they are getting. In the PDF supplied shows a very simple homemade tool holder one of which I am going to make and try for my 1/8 slot needed. The beauty of it is that it gives the same results on the lathe. I liked the one gentleman’s comments that he uses nothing but spring type tooling even on his CNC lathe. This type of tooling was pretty big way back yonder but forgotten today Ummmmm. Anyway I thank you for your suggestion even though my afternoon now is making such a holder.
Happy days………….. Anthony.
John Hill:
I am pleased you are getting more positive results with a change of materials. :thumbup:
I suppose there is a place for the spring tools but I do noT understand how they could be an advantage when 'spring' is what seems to cause most problems for shaperites!
Bryan:
John, I believe the spring holders work by changing the location of the flex. The fact that they also add more flex is a red herring. If you made a rigid holder that set the cutting edge behind the clapper I think you would get the same result, or possibly better. When I get a chance I will attempt to prove (or disprove) this.
Bryan:
Anthony, John and other shaper-nuts. I made an offset holder but it didn't help much. What did help was reducing front clearance to about 3 deg. And fine feed, eg .02 - .05mm.
Davo J:
Going by your pictures you have negative rake on the tool. It would help a lot if you changed this to positive rake.
Here are some links I chased up for you.
http://www.neme-s.org/shapers/columns/shaper_column_41.html
http://books.google.com.au/books?id=Nt8DAAAAMBAJ&pg=PA234&lpg=PA234&dq=metal+shaper+tool+grinding&source=bl&ots=BLjPDxzNvS&sig=F5F3uSWT7-wWWpdvb8vE_oCLh0U&hl=en&ei=bT_jTayqO4S0rAfalvSzBg&sa=X&oi=book_result&ct=result&resnum=7&ved=0CFAQ6AEwBg#v=onepage&q=metal%20shaper%20tool%20grinding&f=false
This one is a free down load of the book, but you have to wait 30 seconds for it.
http://terrificshare.com/search/%7B814627FB-D5C2-48E3-AB2B-C5883BC7FFBE%7D.htm
Dave
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