Date: Sun, 27 Sep 1998 19:07:46 -0400 Subject: COZY: Control Bearings From: dhill36@juno.com (Dana Hill) Regarding cdenk's post regarding bearing options I had a question, Is it actually 'corrosion' that is a concern or were you more specifically concerned with the steel wearing? Thanx for the info. D. Hill Cozy IV, #676 Ch 4/5 ___________________________________________________________________ You don't need to buy Internet access to use free Internet e-mail. Get completely free e-mail from Juno at http://www.juno.com Or call Juno at (800) 654-JUNO [654-5866] Date: Mon, 28 Sep 1998 08:10:36 +0200 From: Rego Burger Subject: Re: COZY: Control Bearings >>>>>>>Changed CS-152 5/8" tube to stainless steel, anticipating possibility of corrosion of steel,<<<<<< Be very careful folks... I don't sit with my plans here at work but if I'm correct the steel tubes go into aluminium tubes...if so replacing it with stainless is NOT a good thing because the two metals react with time and Cause corrosion. Haven't got the "book" to quote details but do some research via a metal expert before you put them into service. Regards Rego Burger. From: cdenk@ix.netcom.com Date: Mon, 28 Sep 1998 07:33:29 -0500 (CDT) Subject: Re: COZY: Control Bearings Rego writes<2 metals in contact with each other> Agree that is a concern, which is the lesser of the evil - bare steel (drawings show 4130N, no plating or coating), or stainless steel in contact with aluminum. Stainless steel screws seem to be less of an issue than steel screws (plated). Do we have a metalurgist on line? Don't have time now, but would be interested if accepted practices comments on the subject. Date: Mon, 28 Sep 1998 22:29:56 +0100 From: Jean-Jacques CLAUS Subject: Re: COZY: Control Bearings Enter your name here wrote: > > For anyone having used ball bearing rings, did the ring have an > internal ring also or are there any where the balls actually roll on your > steel tube(CS106, CS115, CS152)? > > Bill Kastenholz > wkasty@ix.netcom.com Hi all, I didn't like the phenolic bearing idea as per plans so i changed and choose the following bearings for the control system. I found the RBC Pitchlign bearings in the SPHERCO catalog of my local reseller. IR7173 are used for wing/aileron and f.s station in the fuselage. IR7174 are used for the firewall location. To install them you just need to bore the phenolic plate to 7/8" and flox them in place. RBC PitchlignŽ | d | F | B | | INNER | Inside Dia | Outside Dia | Width| | RING | | | |Approx| PART |____________________ |_____________________| +.000|Weight| No. | Nom. | Min.| Max.| Nom. | Max.| Min.| -.005|(lbs.)| IR 7173 | 5/8| .6246| .6250| 7/8| .8743| .8738| .760| .058| IR 7174 | 5/8| .6246| .6250| 7/8| .8743| .8738| 1.010| .077| hope that help, Jean-Jacques Claus French Cosy Builder http://www.mygale.org/05/jclaus From: "Enter your name here" Subject: Re: COZY: Control Bearings Date: Tue, 29 Sep 1998 15:38:59 -0400 > >>>>>>>Changed CS-152 5/8" tube to stainless steel, anticipating >possibility of >corrosion of steel,<<<<<< > >SS and aluminum are very bad combination. With time they will react and >will be fused together. The reaction works much faster in salty air >environment. I see it all the time. It keeps the boat serviceman busy. >For the control system inside the fuselage I used 5/8" (CS-152)Delrin >rod from the plastics shop and instead of the Phenolyc bearings, I made >mine from 1/4" Nylon plate. This combination is light, strong, corrosion >free and self lubricating. I have seen per plans installations here in >FL and they were rusted very bad even before the plane was completed. >Regards >Bulent > Hello builders, I sort of started this control bearing discussions thread by asking Carl Denk for the specs on bearings he used. Right now I am leaning towards using needle bearings in front of the control stick and Delrin or Phenolic as called out in the plans for the mid-cabin and aileron positions. I took a look at the Torrington spherical bearings discussed in the CSA newletter and thought they were rather rough looking. For anyone having used ball bearing rings, did the ring have an internal ring also or are there any where the balls actually roll on your steel tube(CS106, CS115, CS152)? Bill Kastenholz wkasty@ix.netcom.com Date: Tue, 29 Sep 1998 22:06:43 -0500 From: Bulent Aliev Subject: Re: COZY: Control Bearings " Regarding cdenk's post regarding bearing options I had a question, Is it actually 'corrosion' that is a concern or were you more specifically concerned with the steel wearing?" My personal concern was the possibility of the rusty steel tube grinding away at the phenolic bearing. I have seen it and you can hear it too.These bearings are in very hard to get place under the arm rests. That is the reason I opted for the Delrin/Nylon combination. I think they are better choice for us in South FL. In C. Denk's set up there is no problem with the SS tube going through the bearing. It is a better choice than steel. The possibility for corrosion is only where the SS tube slips in the aluminum tube and is held together with steel bolt. In dry climate that would not be a problem. Just my opinion. Bulent From: cdenk@ix.netcom.com Date: Wed, 30 Sep 1998 14:30:07 -0500 (CDT) Subject: Re: COZY: Control Bearings Kastenholtz says Need some angular flexibility, the u-joint aft is reason. ball bearings with 5/8" bore have more than enough load carrying capacity. Needle bearings are rigid angle movement wise unless mounted in a spherical member. Also needles will be more friction and weight. From: cdenk@ix.netcom.com Date: Wed, 30 Sep 1998 14:34:55 -0500 (CDT) Subject: Re: COZY: Control Bearings No the bearings I used have an inner race with a 5/8" bore, balls and a retainer to keep the balls spaced, oil seals both sides and an outer race. I thing the outer race had a snap ring like shoulder on its outside diameter.