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Gallery, Projects and General => How do I?? => Topic started by: DarrenUK on March 01, 2014, 01:19:29 PM

Title: How do I scribe a taper?
Post by: DarrenUK on March 01, 2014, 01:19:29 PM

Can anyone suggest a tool or a quick easy way that I can use to scribe a straight line down the centre length of a tapered bar?

I know I could measure and mark each end at the centre then just use a straight edge to scribe but would like to find a quicker alternative method.

Red line on image below is where I want to scribe.

Title: Re: How do I scribe a taper?
Post by: Pete. on March 01, 2014, 01:42:10 PM

Mount it between centres on a lathe and use a height gauge scriber along the top of a piece of bar held in a toolpost at centre height.

Title: Re: How do I scribe a taper?
Post by: Stilldrillin on March 01, 2014, 05:37:23 PM

Quote from: Pete. on March 01, 2014, 01:42:10 PM

Mount it between centres on a lathe and use a height gauge scriber along the top of a piece of bar held in a toolpost at centre height.

I like that idea Pete!  :thumbup:

David D

Title: Re: How do I scribe a taper?
Post by: DarrenUK on March 02, 2014, 03:01:52 AM

Forgot to mention, I have no lathe, just a small SX2 milling machine and a few basic tools.

Title: Re: How do I scribe a taper?
Post by: angus on March 02, 2014, 03:24:43 AM

how accurate does it need to be ???

use some marking out blue

dirty way put in a vice holding the ends, the holding a spirit level, and looking at the bubble drag it along the top edge

will be fairly close, but maybe not close enough for what you want ?

Title: Re: How do I scribe a taper?
Post by: ieezitin on March 02, 2014, 08:06:51 AM

Darren

put on a surface plate build up smallest end with gage blocks (mill one since you have a mill)...you could use adjustable parallels,  You could use a sine bar get the angle and lay it top to tail on it.

Without some tooling its not easy to do.

Anthony.

Title: Re: How do I scribe a taper?
Post by: ausdier on March 03, 2014, 09:51:49 AM

Reply #9 over here I think is a good simple answer.
http://www.modelenginemaker.com/index.php/topic,3285.0.html