Likes: 0
Picture(s) thanks: 0
Results 1 to 4 of 4
Thread: BarleyTwist Dimensioning
-
24th March 2017, 09:32 AM #1New Member
- Join Date
- Jul 2011
- Location
- Sunshine Coast Queensland
- Posts
- 6
BarleyTwist Dimensioning
I want to create a double open barleytwist using my small lathe.
My piece of timber is 40mm diameter, I have drilled a 10mm hole all the way through.
Normally with a 20mm radius, I would mark 20mm segments along the length giving me a full twist in 80mm. If however I have reduced the amount of timber depth by 5mm (radius of centre hole) then would I make the segments 15mm (20mm - 5mm) resulting in a full twist in 60mm?
This way I see the open twists being 15mm in diameter each
Comments please
Tony
-
24th March 2017 09:32 AM # ADSGoogle Adsense Advertisement
- Join Date
- Always
- Location
- Advertising world
- Posts
- Many
-
24th March 2017, 07:11 PM #2
It depends on what "air gap" you want between the spirals, but in my opinion you're on the right path.
With 15mm twists doing a full turn every 60mm then you will have a 15mm air gap between each strand. ie. it's the same as the strand thickness, which I think looks best.
There are times when you need to change the air gap, but usually only when doing show-off pieces, such as trapped balls, etc. (Which I've never managed to succesfully pull off, but one can dream. )
- Andy Mc
-
25th March 2017, 10:19 AM #3New Member
- Join Date
- Jul 2011
- Location
- Sunshine Coast Queensland
- Posts
- 6
I felt if I used 20mm segments then my spiral would be 20mm x 15mm, oval not round
-
26th March 2017, 06:20 PM #4
This is where the air gap I mentioned comes in.
If you marked it out in 20mm segments and kept the spiral cross-section round at 15mm radius, the air gap to the next segment would be 25mm. (The 20mm mark plus the 5mm you 'took away' from the previous mark.)
Rather than confuse the issue, lets just say: "Yes. Marking it out in 15mm segments should give you what you want."
- Andy Mc
Similar Threads
-
Dimensioning backsaw plate.
By planemaker in forum Saws- handmadeReplies: 7Last Post: 23rd April 2014, 10:11 AM -
Trailer Dimensioning
By Grahame Collins in forum TRAILERS & OTHER FABRICATED STUFFReplies: 9Last Post: 6th March 2011, 02:53 AM -
What's the Japanese method of dimensioning lumber?
By applebuilder in forum JAPANESE HAND TOOLSReplies: 4Last Post: 22nd September 2009, 01:29 PM -
dimensioning timber by hand
By simon_b in forum HAND TOOLS - UNPOWEREDReplies: 12Last Post: 27th December 2007, 01:39 PM -
Dimensioning a torsion box?
By Auld Bassoon in forum WOODWORK - GENERALReplies: 6Last Post: 22nd June 2006, 10:18 PM