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18th Jul 2019, 08:27 PM #1.
- Join Date
- Nov 2008
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- Perth WA
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- 71
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- 6,459
Using Eccentric Engineering's Turnado Tracing Attachment
I have rekindled my interest in the little Hercus No.O mill that I've owned for probably fifteen years and with that interest has come a desire to make some "improvements".
The Y axis feed handwheel features a piddly little tear drop handle, the same handwheel and handle are fitted to the 9" and 260 lathes tailstocks where they move a spindle whereas the O's moves a cast iron table. I'm my mind the handle is too small. Hercus fitted a larger handwheel and handle on the mill table's X axis so I thought I would see if there would be an improvement if a larger handle was fitted. There was ...
IMG_20190717_113007313.jpg
Several years ago I received from Hercus several ball handles along with their little tear drops so I thought I could simply press in one of the larger tear drops in place of the tiddler.
IMG_20190717_113447621.jpg
Then I realised the shape of the handle was different so I decided it was time to put the Turnado to use. I drew what I thought was a pretty close copy of the original handle on some aluminium and made a half template. Turns out my drawing skills are a touch lacking. The handle looks like it is for the 13, not the Hercus. Another error was not rough turning the 1214 blank to its approximate finished shape. Next time....
IMG_20190718_133048726 (1).jpg IMG_20190718_134245585.jpg IMG_20190718_145949322.jpg IMG_20190718_150917417.jpg
The red painted handwheel was salvaged from a Hercus No.3 tool and cutter and it is the same size as that fitted to the mill's X axis.
BT
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18th Jul 2019, 09:02 PM #2
Came out great Bob, I had a go at free handing a small knob the other day, it came out OK but not exactly what I wanted.
I'll be looking into making a ball Turner and am very interested in a setup like yours.Using Tapatalk
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18th Jul 2019, 09:35 PM #3Most Valued Member
- Join Date
- Apr 2012
- Location
- Healesville
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- 2,129
Very nice Bob,
How about one of these (or similar) for matching and marking out your profiles.
https://www.ebay.com.au/itm/10-Shape...8AAOSw6TtdJa6A
cheers, shed
this looks better than the placka one https://www.ebay.com.au/itm/CONTOUR-...oAAOSw32lY2GL7
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18th Jul 2019, 09:52 PM #4.
- Join Date
- Nov 2008
- Location
- Perth WA
- Age
- 71
- Posts
- 6,459
Thanks J,
I just hit the button for something similar while you would have been typing - https://www.ebay.com.au/itm/6-Profil...sAAOSwnaJdJt64
Bob.
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18th Jul 2019, 10:04 PM #5
I've had that second link one for probably 25 years, bought for me as a present from my daughter when I used to do wood working a lot.
It sits in my machining draws well oiled in a clip lock bag as it's not stainless, has been handy over the years for both wood and metal etc, never thought of using it for these handles thanks for the idea.Using Tapatalk
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18th Jul 2019, 10:19 PM #6
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25th Jul 2019, 07:57 PM #7.
- Join Date
- Nov 2008
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- Perth WA
- Age
- 71
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- 6,459
I thought I would have another go while waiting for the profile gauge to arrive. I revised the template profile and rough turned the blank. While the shape isn't a dead ringer for the original, it'll do.
IMG_20190721_143809066.jpg IMG_20190725_153748696.jpg IMG_20190723_160325272.jpg
And here's the original X axis handwheel.
IMG_20190723_160409808.jpg
In my mind the larger handle transforms for the better the feel of the cross slide handwheel.
The Turnado utilises a stepped pivot pin to locate the toolpost and the left hand end of the tracing attachment's fence. It is small and as I found out, readily sucked up into a vacuum cleaner nozzle. So to avoid permanent loss I made a couple of stay put pivot pins. Tightening the fence's right hand clamp causes the fence to lift up slightly so the new fence pivot is in the form of a clamp. The toolpost pivot is simply a turned down M5 stainless steel cap screw.
IMG_20190725_151705317.jpg IMG_20190725_151624682.jpg IMG_20190725_151542268.jpg IMG_20190725_151750194.jpg IMG_20190725_152148008.jpg IMG_20190725_152859157.jpg IMG_20190725_151958508.jpg
BT
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26th Jul 2019, 11:21 AM #8Senior Member
- Join Date
- Aug 2013
- Location
- Melbourne
- Posts
- 229
Freehand turning
For some good freehand turning l would like to recommend "Max Grant, the Swan Valley machine shop" on YouTube. I don't have specific episodes for the freehand turning however there are a few in his library, his other videos are pretty good too.
Cheers
Pete
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