Matronics Email Lists :: View topic

Matronics Email Lists
Web Forum Interface to the Matronics Email Lists

Get Email Distribution Too! FAQ Search Memberlist Usergroups Register

Profile Log in to check your private messages Log in

tooling holes

Matronics Email Lists Forum Index -> Zenith-List

View previous topic :: View next topic

Author Message

djluscher

Joined: 01 Oct 2009
Posts: 3

Posted: Sun Nov 08, 2009 7:48 am Post subject: tooling holes

Hi Group,

I'm just starting to build CH750 from plans and am making form blocks for the rudder ribs.  The plans only indicate the location for tooling holes on the nose rib.  The others are unspecified and I was seeking some advice/assurance on using two or three 1/4" holes on the center line of each rib to hold blanks between the form blocks.  On the narrow end of the ribs these holes will be within an inch of the flange.



Is this OK?  Any rules of thumb for drilling holes in small ribs?

thanks in advance,

DJ

- The Matronics Zenith-List Email Forum -

Use the List Feature Navigator to browse the many List utilities available such as the Email Subscriptions page, Archive Search & Download, 7-Day Browse, Chat, FAQ, Photoshare, and much more:

http://www.matronics.com/Navigator?Zenith-List

larry(at)macsmachine.com
Guest

Posted: Sun Nov 08, 2009 11:15 am Post subject: tooling holes

Hi DJ,

Tooling holes are generally found on the centerline, but just be careful 

that that hole doesn't interfere with

points of attachment etc. Presuming the holes will be used to sandwich 

the rib between forms and center flanged holes.

You only need one every foot or so. The vise you use to grip while 

hammering flanges will provide a better hold at small ends.

Don't forget to add the 7-degree over bend angle.



Larry McFarland 602HDS at www.macsmachine.com



djluscher wrote:

 	  Quote: 	
		   



 Hi Group,

 I'm just starting to build CH750 from plans and am making form blocks for the rudder ribs.  The plans only indicate the location for tooling holes on the nose rib.  The others are unspecified and I was seeking some advice/assurance on using two or three 1/4" holes on the center line of each rib to hold blanks between the form blocks.  On the narrow end of the ribs these holes will be within an inch of the flange.



 Is this OK?  Any rules of thumb for drilling holes in small ribs?

 thanks in advance,

 DJ





 Read this topic online here:



 http://forums.matronics.com/viewtopic.php?p 71693#271693

- The Matronics Zenith-List Email Forum -

Use the List Feature Navigator to browse the many List utilities available such as the Email Subscriptions page, Archive Search & Download, 7-Day Browse, Chat, FAQ, Photoshare, and much more:

http://www.matronics.com/Navigator?Zenith-List

djluscher

Joined: 01 Oct 2009
Posts: 3

Posted: Sun Nov 08, 2009 3:01 pm Post subject: Re: tooling holes

Hi Larry,

Thanks for the guidance.  To be clear, many of the rudder ribs have flanges 2 degree open.  Do you mean a 7-degree relief or bevel on the rib form is a good number to get a 92 degree flange or do you mean I should bevel form blocks 7-degrees closed beyond the desired flange angle (5 degrees total bevel in this case?)  I see 10-deg net called out in the construction standards from Zenith, but am anxious to hear what angle has proven to work best in practice.  

thanks again,

DJ

 	  larry(at)macsmachine.com wrote: 	
		  Hi DJ,

Tooling holes are generally found on the centerline, but just be careful 

that that hole doesn't interfere with

points of attachment etc. Presuming the holes will be used to sandwich 

the rib between forms and center flanged holes.

You only need one every foot or so. The vise you use to grip while 

hammering flanges will provide a better hold at small ends.

Don't forget to add the 7-degree over bend angle.



Larry McFarland 602HDS at www.macsmachine.com



djluscher wrote:

 	  Quote: 	
		   



 Hi Group,

 I'm just starting to build CH750 from plans and am making form blocks for the rudder ribs.  The plans only indicate the location for tooling holes on the nose rib.  The others are unspecified and I was seeking some advice/assurance on using two or three 1/4" holes on the center line of each rib to hold blanks between the form blocks.  On the narrow end of the ribs these holes will be within an inch of the flange.



 Is this OK?  Any rules of thumb for drilling holes in small ribs?

 thanks in advance,

 DJ





 Read this topic online here:



 http://forums.matronics.com/viewtopic.php?p 71693#271693

- The Matronics Zenith-List Email Forum -

Use the List Feature Navigator to browse the many List utilities available such as the Email Subscriptions page, Archive Search & Download, 7-Day Browse, Chat, FAQ, Photoshare, and much more:

http://www.matronics.com/Navigator?Zenith-List

kmccune

Joined: 22 Sep 2007
Posts: 577
Location: Wisconsin, USA

Posted: Sun Nov 08, 2009 5:02 pm Post subject: Re: tooling holes

I don't think the location of the tooling holes are that critical in the rear rudder ribs as they are just a way to clamp the form around the rib blank. ( do put them on the center line. But then I'm I lovely down town Chicago, getting ready for a 10 day Fabtech trade show marathon....   so I don't have my prints handy, and though they are 701 prints,they may have helped.

The over bend is for "spring back" if you make the form block corner 90 degrees the formed part will "spring back" 6-8 degrees. So if you want a 2 degree open rib flange, then you need to make your form block 92 degrees minus 6-8 degrees. Don't sweat it though as you can tweak them a little if they are not perfect. 

I would suggest getting the Metal working 101 video from John C, it guides you through scratch building a 701 rudder. A little different for sure, but the techniques are the same for all of the Zenith line.



Kevin

- The Matronics Zenith-List Email Forum -

Use the List Feature Navigator to browse the many List utilities available such as the Email Subscriptions page, Archive Search & Download, 7-Day Browse, Chat, FAQ, Photoshare, and much more:

http://www.matronics.com/Navigator?Zenith-List

_________________
“Always do what you are afraid to do.”
R.W. Emerson (1803-1882)

"Real freedom is the sustained act of being an individual." WW - 2009

"Life is a good deal...it's worth it" Feb 1969
Dorothy McCune

larry(at)macsmachine.com
Guest

Posted: Mon Nov 09, 2009 6:43 am Post subject: tooling holes

djluscher wrote:

 	  Quote: 	
		   



 Hi Larry,

 Thanks for the guidance.  To be clear, many of the rudder ribs have flanges 2 degree open.  Do you mean a 7-degree relief or bevel on the rib form is a good number to get a 92 degree flange or do you mean I should bevel form blocks 7-degrees closed beyond the desired flange angle (5 degrees total bevel in this case?)  I see 10-deg net called out in the construction standards from Zenith, but am anxious to hear what angle has proven to work best in practice.  

 thanks again,

 DJ

 DJ, the forms should allow you to overbend the aluminum 7-degrees to get a real 90-degree bend.

   

    Any other, more or less according to the drawing requirements can be 
	


adjusted by hand.



    Larry McFarland 601HDS at www.macsmachine.com

     do not archive

 	  Quote: 	
		   larry(at)macsmachine.com wrote:

   

> Hi DJ,

> Tooling holes are generally found on the centerline, but just be careful 

> that that hole doesn't interfere with

> points of attachment etc. Presuming the holes will be used to sandwich 

> the rib between forms and center flanged holes.

> You only need one every foot or so. The vise you use to grip while 

> hammering flanges will provide a better hold at small ends.

> Don't forget to add the 7-degree over bend angle.

>

> Larry McFarland 602HDS at www.macsmachine.com

>

> djluscher wrote:

>

>     

>>  

>>

>>  Hi Group,

>>  I'm just starting to build CH750 from plans and am making form blocks for the rudder ribs.  The plans only indicate the location for tooling holes on the nose rib.  The others are unspecified and I was seeking some advice/assurance on using two or three 1/4" holes on the center line of each rib to hold blanks between the form blocks.  On the narrow end of the ribs these holes will be within an inch of the flange.

>>

>>  Is this OK?  Any rules of thumb for drilling holes in small ribs?

>>  thanks in advance,

>>  DJ

>>

>>

>>

>>

>>  Read this topic online here:

>>

>>  http://forums.matronics.com/viewtopic.php?p 71693#271693

>>

>>

>>

>>

>>

>>

>>

>>    

>>

>>

>>       



 Read this topic online here:



 http://forums.matronics.com/viewtopic.php?p 71737#271737

- The Matronics Zenith-List Email Forum -

Use the List Feature Navigator to browse the many List utilities available such as the Email Subscriptions page, Archive Search & Download, 7-Day Browse, Chat, FAQ, Photoshare, and much more:

http://www.matronics.com/Navigator?Zenith-List

djluscher

Joined: 01 Oct 2009
Posts: 3

Posted: Tue Nov 10, 2009 6:01 am Post subject: Re: tooling holes

Thanks, Larry and Kevin. It is appreciated. -D

- The Matronics Zenith-List Email Forum -

Use the List Feature Navigator to browse the many List utilities available such as the Email Subscriptions page, Archive Search & Download, 7-Day Browse, Chat, FAQ, Photoshare, and much more:

http://www.matronics.com/Navigator?Zenith-List

Display posts from previous:

	Matronics Email Lists Forum Index -> Zenith-List	All times are GMT - 8 Hours
Page 1 of 1

Jump to:

You cannot post new topics in this forum
You cannot reply to topics in this forum
You cannot edit your posts in this forum
You cannot delete your posts in this forum
You cannot vote in polls in this forum
You cannot attach files in this forum
You can download files in this forum