How to make larger diameter centering rings?
David Thedens
Hi all,
My 4" diameter Little Joe II and 4" Mosquito have been quite good
flyers. The Mosquito went up on a H128 last time. The LJII on a G64
but it is strong enough for an H128 too.
But I want to build larger diameter versions of both with a 38mm mount.
The centering ring cutters that I have are adjustable but only extend
about 2 inches, which makes centering rings up to 4". Duh.
Is there anything available that will cut centering rings in the 5.4"
and 7.5" range? Or do I have to machine some kind of cutter shaft
that fits on my current adjustable cutters?
At the price that LOC wants for the big tubes I think I'll just purchase
the $100 minimun quantity from Paramount Tube. The only problem is they
do not have the exact 5.380 arbor. If anyone has a 5.38 nosecone and
would care to measure it, that would be great. Thanks
They do have the 7.515 diameter.
dave
Ken Lake
You can easily make centering rings with a router... if you have one. If
so, drop by your local library and pick up a book on router jigs and
techniques. It's pretty easy to do but you have to either purchase or
build the circle cutting jig. Hope I was able to help.
Ken Lake
The Silent Observer
David Thedens wrote:
>
>
> Is there anything available that will cut centering rings in the 5.4"
> and 7.5" range? Or do I have to machine some kind of cutter shaft
> that fits on my current adjustable cutters?
>
Another poster has already suggested a circle cutting jig for a router --
the same thing can be done very easily with a sabre saw, bandsaw, or
jigsaw; one could also rough-cut the rings with anything (even a keyhole
saw) and then sand them to final dimension with a jig and a belt or disc
sander.
--
A confidence man knows he's lying; that limits his scope. But a
successful shaman believes what he says -- and belief is contagious;
there is no limit to >his< scope. -- Jubal Harshaw, M.D, J.D.
Donald Qualls, aka The Silent Observer NAR # 70141-SR Insured
sil...@ix.netcom.com http://members.aol.com/silntobsvr/home.htm
Rocket Pages http://members.aol.com/silntobsvr/modrocs.htm
Opinions expressed are my own -- take them for what they're worth
and don't expect them to be perfect.
Mark U
David Thedens <dav...@boi.hp.com> writes: >
> Hi all,
> >snip<
>
> Is there anything available that will cut centering rings in the 5.4"
> and 7.5" range? Or do I have to machine some kind of cutter shaft
> that fits on my current adjustable cutters?
>
>
> dave
Dave
I have a trepanning tool (circle cutter) from McMaster Carr that cuts
from 1.75 in. to 7.875 in. in dia. the price is very reasonable.
Check it out.
Mark U TRA 3167
Darrell D. Mobley
Mark U wrote:
> I have a trepanning tool (circle cutter) from McMaster Carr that cuts
> from 1.75 in. to 7.875 in. in dia. the price is very reasonable.
> Check it out.
Ah yes, the ubiquitous McMaster-Carr Company. I have heard about them.
Do they really exist? You couldn't tell by requesting a catalog...
Darrell
--
Visit "Rocketry Online" at http://www.RocketryOnline.com for the latest
rocketry-oriented Internet information.
*THE* icon of hobby rocketry...
Foxeye
McMaster Carr catalogs are *very* hard to get ahold of, but they do
exist, and they ship very quickly, but alass the prices are high, but
so is their quality and the material they carry is vast........
Fox...@www.mindspring.com
By sending unsolicited commercially-oriented e-mail to this address, the
sender agrees to pay a $100 flat fee to the recipient for proofreading
services. Take the www out of address to send email.
Bob Kaplow
In article <335CFF...@boi.hp.com>, David Thedens <dav...@boi.hp.com> writes:
> My 4" diameter Little Joe II and 4" Mosquito have been quite good
> flyers. The Mosquito went up on a H128 last time. The LJII on a G64
> but it is strong enough for an H128 too.
>
> But I want to build larger diameter versions of both with a 38mm mount.
> The centering ring cutters that I have are adjustable but only extend
> about 2 inches, which makes centering rings up to 4". Duh.
>
> and 7.5" range? Or do I have to machine some kind of cutter shaft
> that fits on my current adjustable cutters?
The one I got is a General #55, and it is advertized as good to 6", but
looks like it will go to nearly 8". I recently saw one at Farm&Fleet (sorry,
I can't recall the brand, but it was probably VA or Irwin as those are their
brands of drill bits) that did go to 8". Since I only have an 8" drill
press, that's my limit anyway. If you DO go larger, you'll wnat to run a
VERY SLOW cutter speed to reduce vibration.
Bob Kaplow NAR # 18L TRA # "Abort, Retry, Fail?"
Mike Bellino
Darrell D. Mobley wrote:
> Ah yes, the ubiquitous McMaster-Carr Company. I have heard about them.
> Do they really exist? You couldn't tell by requesting a catalog...
>
> Darrell
Darrell,
McMaster-Carr Supply Company: (908)329-3200 New Brunswick, NJ.
Cheers,
Mike Bellino
--
*****************************************
*** Picard for President: Make it so. ***
*****************************************