X-Virus-Scanned: clean according to Sophos on Logan.com Return-Path: Received: from [204.127.217.102] (HELO fmailhost01.isp.att.net) by logan.com (CommuniGate Pro SMTP 5.2.3) with ESMTP id 2912527 for flyrotary@lancaironline.net; Wed, 07 May 2008 15:07:29 -0400 Received-SPF: none receiver=logan.com; client-ip=204.127.217.102; envelope-from=keltro@att.net Received: from fwebmail34.isp.att.net ([207.115.9.164]) by isp.att.net (frfwmhc02) with SMTP id <20080507190649H0200r3lice>; Wed, 7 May 2008 19:06:49 +0000 X-Originating-IP: [207.115.9.164] Received: from [64.250.200.52] by fwebmail34.isp.att.net; Wed, 07 May 2008 19:06:48 +0000 From: "Kelly Troyer" To: "Rotary motors in aircraft" Subject: Re: [FlyRotary] Need ideas for bolts Date: Wed, 07 May 2008 19:06:48 +0000 Message-Id: <050720081906.5933.4821FDC7000726670000172D22243429029B0A02D29B9B0EBF019D9B040A05@att.net> In-Reply-To: X-Mailer: AT&T Message Center Version 1 (Mar 10 2008) X-Authenticated-Sender: a2VsdHJvQGF0dC5uZXQ= MIME-Version: 1.0 Content-Type: multipart/alternative; boundary="NextPart_Webmail_9m3u9jl4l_5933_1210187208_0" --NextPart_Webmail_9m3u9jl4l_5933_1210187208_0 Content-Type: text/plain Content-Transfer-Encoding: 8bit Ernest, Recheck the thread pitch of the bolts to engine.........If I recall correctly they are 10mm X 1.25mm pitch........ -- Kelly Troyer "Dyke Delta"_13B ROTARY Engine "RWS"_RD1C/EC2/EM2 "Mistral"_Backplate/Oil Manifold -------------- Original message from Ernest Christley : -------------- > I thought this would be easy. It's not. I'm trying to come up with a > better idea now. > > Problem: The gearbox I have bolts up to a 1/2" plate. There are 6" > standoffs between the plate and the rear face of the engine. Two of the > standoffs are drilled to encompass a single bolt, and the other two are > wide enough to contain 2 bolts each. We planned to use bolts through > all the pieces into the back of the engine. The bolts would need to be > 180mm long M10 with a 1.00mm thread pitch. Because it will be holding > the prop, I consider it prudent to specify 10.9 grade bolts (equivalent > to Class8). Wilders, the local bolt specialty shop, gives me a quote of > $36 each. I'd need 6 of them. I could get a box of 10 at $30.67 > each. Ouch!! > > I could do that, crying the whole time, and may possibly have to yet; > but, I think it might be smarter to explore other options first (and ask > people smarter than I). I'm thinking the best way to go would be to > find a way to use standard length bolts. For instance, for the two > standoffs that have two holes, we could cut a recess into each side to > uncover the drilled hole. That would allow one bolt to attach the > standoff to the engine and another to attach the plate. But that would > severely compromise the clamp-up forces that hold the whole thing > together and allow it to get "wobbly". Threaded rod or studs are > possibilities, but I've not been able to find either. > > Where can I find extra long, high grade metric bolts that aren't > specialty order items? > What other options do I have for securely bolting a plate to the back of > the engine with 6" spacer? > > -- > Homepage: http://www.flyrotary.com/ > Archive and UnSub: http://mail.lancaironline.net:81/lists/flyrotary/List.html --NextPart_Webmail_9m3u9jl4l_5933_1210187208_0 Content-Type: multipart/related; boundary="NextPart_Webmail_9m3u9jl4l_5933_1210187208_1" --NextPart_Webmail_9m3u9jl4l_5933_1210187208_1 Content-Type: text/html Content-Transfer-Encoding: 8bit

Ernest,

Recheck the thread pitch of the bolts to engine.........If I recall correctly

they are 10mm X 1.25mm pitch........

--
Kelly Troyer
"Dyke Delta"_13B ROTARY Engine
"RWS"_RD1C/EC2/EM2
"Mistral"_Backplate/Oil Manifold

-------------- Original message from Ernest Christley <echristley@nc.rr.com>: --------------

> I thought this would be easy. It's not. I'm trying to come up with a
> better idea now.
>
> Problem: The gearbox I have bolts up to a 1/2" plate. There are 6"
> standoffs between the plate and the rear face of the engine. Two of the
> standoffs are drilled to encompass a single bolt, and the other two are
> wide enough to contain 2 bolts each. We planned to use bolts through
> all the pieces into the back of the engine. The bolts would need to be
> 180mm long M10 with a 1.00mm thread pitch. Because it will be holding
> the prop, I consider it prudent to specify 10.9 grade bolts (equivalent
> to Class8). Wilders, the local bolt specialty shop, gives me a quote of
> $36 each. I'd need 6 of them. I could get a box of 10 at $30.67
> each. Ouch!!
>
> I could do that, crying the whole time, and may possibly have to yet;
> but, I think it might be smarter to explore other options first (and ask
> people smarter than I). I'm thinking the best way to go would be to
> find a way to use standard length bolts. For instance, for the two
> standoffs that have two holes, we could cut a recess into each side to
> uncover the drilled hole. That would allow one bolt to attach the
> standoff to the engine and another to attach the plate. But that would
> severely compromise the clamp-up forces that hold the whole thing
> together and allow it to get "wobbly". Threaded rod or studs are
> possibilities, but I've not been able to find either.
>
> Where can I find extra long, high grade metric bolts that aren't
> specialty order items?
> What other options do I have for securely bolting a plate to the back of
> the engine with 6" spacer?
>
> --
> Homepage: http://www.flyrotary.com/
> Archive and UnSub: http://mail.lancaironline.net:81/lists/flyrotary/List.html

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