SMALL - espritmodel.com SMALL - Telemetry SMALL - Radio
 
Thread Tools
Old Feb 18, 2012, 04:33 PM
Dirk
Guest
n/a Posts
Triangular edge

Hi, pondering on how to grasp a 60 degrees triangle straight edge in
the vise. Want to scrape it flat after milling, so some force is
involved, hi. Left one of three sides undone, remaining a 30mm a
circular segment.
BR, Dirk
Old Feb 18, 2012, 07:12 PM
Mark Rand
Guest
n/a Posts
Re: Triangular edge

On Sat, 18 Feb 2012 23:33:00 +0100, Dirk <df.ganzinga@jezusmail.com> wrote:


>Hi, pondering on how to grasp a 60 degrees triangle straight edge in
>the vise. Want to scrape it flat after milling, so some force is
>involved, hi. Left one of three sides undone, remaining a 30mm a
>circular segment.
>BR, Dirk
>


When I made a 60 degree template, (215mm long by 55mm high) I fitted 12mm dia
handles to the ends, screwed in and held with Loctite. I could then hold the
template in the vice with the handles.

A better way is to use a sash cramp http://tinyurl.com/6t3bfn5 held in a vice
to grip the ends of the triangle straight edge.

Don't forget to scrape both of the contact faces. It's almost as easy to
scrape all three faces...


I made the 60 template for the dovetails of a Hardinge lathe, In a few weeks
time I need to make a 50 template for a Beaver milling machine.


PS, I must try making a Swiss type pull scraper :-)


Regards
Mark Rand
RTFM
Old Feb 19, 2012, 05:38 AM
Dirk
Guest
n/a Posts
Re: Triangular edge

Mark Rand had uiteengezet :

> On Sat, 18 Feb 2012 23:33:00 +0100, Dirk <df.ganzinga@jezusmail.com> wrote:
>

>> Hi, pondering on how to grasp a 60 degrees triangle straight edge in
>> the vise. Want to scrape it flat after milling, so some force is
>> involved, hi. Left one of three sides undone, remaining a 30mm a
>> circular segment.
>> BR, Dirk
>>

>
> When I made a 60 degree template, (215mm long by 55mm high) I fitted 12mm dia
> handles to the ends, screwed in and held with Loctite. I could then hold the
> template in the vice with the handles.
>
> A better way is to use a sash cramp http://tinyurl.com/6t3bfn5 held in a vice
> to grip the ends of the triangle straight edge.
>
> Don't forget to scrape both of the contact faces. It's almost as easy to
> scrape all three faces...
>
>
> I made the 60 template for the dovetails of a Hardinge lathe, In a few weeks
> time I need to make a 50 template for a Beaver milling machine.
>
>
> PS, I must try making a Swiss type pull scraper :-)
>
>
> Regards
> Mark Rand
> RTFM


Thanks Mark..! That sash clamp-idea looks promising. I will make a wide
400mm wide U from a square bar. The edge screwed in between with two
bolts in the handle holes. Must have a try with a V-grooved wooden
block too.
BTW, made a Swiss scraper from a cheap triangle lathe insert, clamped
onto a 10mm drill rod, bent at "the Agathon angle". Works ok, but it is
kind of difficult to keep the insert tracking the surface, a bit
wobbly. I think the rod must be square and a lot thicker to give better
"stearing". The Bahco inserts are much wider.
Milling an almost perfect 60 degree angle on round stock can be done by
using two axial bolts as indexer / clamping flats. For the second flat
a strip is needed of the same thckness as was cut away before.
Have a nice day,
Dirk
Old Feb 19, 2012, 10:31 AM
Jim Wilkins
Guest
n/a Posts
Re: Triangular edge

"Dirk" <df.ganzinga@jezusmail.com> wrote in message
news:9qan8sF8mnU1@mid.individual.net...

> Hi, pondering on how to grasp a 60 degrees triangle straight edge in the
> vise. Want to scrape it flat after milling, so some force is involved, hi.
> Left one of three sides undone, remaining a 30mm a circular segment.
> BR, Dirk
>

How about a 3-jaw lathe chuck, with an aluminum bar in the toolholder to
support the free end?

jsw
Old Feb 19, 2012, 04:30 PM
Dirk
Guest
n/a Posts
Re: Triangular edge

Na rijp beraad schreef Jim Wilkins :

> "Dirk" <df.ganzinga@jezusmail.com> wrote in message
> news:9qan8sF8mnU1@mid.individual.net...

>> Hi, pondering on how to grasp a 60 degrees triangle straight edge in the
>> vise. Want to scrape it flat after milling, so some force is involved, hi.
>> Left one of three sides undone, remaining a 30mm a circular segment.
>> BR, Dirk
>>

> How about a 3-jaw lathe chuck, with an aluminum bar in the toolholder to
> support the free end?
>
> jsw


Mmmm, my vise does not have a toolholder... This afternoon I did some
scraping using an aluminium angle to protect the top. Skid out only
trice, hi.
 


Thread Tools

Similar Threads
Category Thread Thread Starter Forum Replies Last Post
Discussion Cutting my own triangular sticks? SBS_Pilot The Builders Workshop 8 Sep 14, 2011 11:13 AM
Triangular strip Malc The Builders Workshop 8 Aug 16, 2004 02:54 AM
Pure triangular wing: what airfoil, CG? andyberner Power Systems 3 Feb 05, 2002 06:32 PM