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Thread: form tool - interesting video
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27th October 2014, 03:47 PM #1SENIOR MEMBER
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form tool - interesting video
Some discussion here http://www.hobby-machinist.com/showt...his-shape#post
and a video here https://www.youtube.com/watch?v=n5b7IimlLzg
video is interesting - - I always imagined that a form tool would be pushed in from the side of the workpiece rather than underneath it.
Could I make chess pieces on my little 9" Hercus like this or do I need heaps more power and mass ?
By the time I've learned how to and then ground the cutters it might be easier to make chess pieces manually with the compound or by graving
Will search the forum for graving and chess pieces.
Other links in the original thread are worth looking at for ideas re simple pantograph and following a 2d sketch
Probably already discussed on this forum somewhere - will have a look.
BillLast edited by steamingbill; 27th October 2014 at 04:02 PM. Reason: added pantograph note
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27th October 2014, 05:41 PM #2SENIOR MEMBER
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27th October 2014, 05:50 PM #3
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27th October 2014, 07:12 PM #4SENIOR MEMBER
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T'was only mentioning the hobby machinist link. Makes me wonder how they intend to build up the membership. One month you can view about 6 page counts until you are cut off at the knee's. As of tonight, all I get is.
Dear Guest - In order to be able to view attachments and post, and to access "members only" features of this forum, you have to regisiter
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27th October 2014, 07:21 PM #5SENIOR MEMBER
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Skiving
Phil,
You'd probably know all this stuff inside out and backwards anyway
I thought the most interesting bits were on other links - here they are
http://www.productionmachining.com/a...art-of-skiving -explanation of the tool in the video
photo of a simple pantograph that guides the compound and cross slides using a template behind the lathe
http://s1124.photobucket.com/user/xa...0a9b0.jpg.html
the other idea dicussed was a variation on a pantograph, where you make a pointer attached to the cross slide - keep the tip of the pointer following the line on the drawing that you want to copy and the tool in the toolpost will recreate that shape on the workpiece. A bit like the idea shown in photo above only more prone to error due to following a drawing rather than a physical metal profile.
Bill
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27th October 2014, 08:41 PM #6SENIOR MEMBER
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I'm lost or we arnt talking about two differrent things here. A Skive tool is a form tool, thats mounted below center, to assist with rake. Mostly famous for production machines. And the form had to have alot of adjustments to produce a true form, because the tool wasn't on center line.
The pantograph thing is a poor mans substitute for a copy attachement. Nothing wrong with that. I can do a fair approiximation of 45 deg chamfer just by winding the top & cross slides.
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27th October 2014, 09:43 PM #7SENIOR MEMBER
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yes 2 different things
Phil,
Yes you are right - two different things.
You'd have to read the whole thread to see the context and understand how they discussed those separate issues under the broad topic of "How do I make fancy handles for my machine tools"
Probably nothing interesting for experienced people like yourself, but for me, I thought that little video was amazing and I was impressed with the other ideas and made the initial post in this forum in case others would find the video and the associated discussion of any interest.
I didnt realise that hobby-machinist was a members only forum and that non members wouldnt be able to see the thread. Sorry if I've caused any confusion.
Bill