AirTalk.org Aviation discussions newsgroups   Archives   FAQ   Search   Memberlist   Usergroups   Register   Profile   Log in to check your private messages   Log in  Need Info On Reamers Goto page 1, 2, 3  Next          AirTalk.org Forum Index -> Aircraft Design & Building View previous topic :: View next topic   Author Message DonMorrisey Guest Posted: Sun Jan 21, 2007 7:11 am    Post subject: Need Info On Reamers I'm trying to figure out how and where to buy reamers. I need to create some 5/8" and 1/2" holes in ultra high molecular weight polyethylene blocks for my control system. The aileron push tubes slide thorugh the blocks and the aileron actuators mount in the blocks as well. The mounting component of my aileron actuator is 5/8", so when buying the .6250" reamer is that already slightly oversized? I have been told the holes should be oversized by .002". I have looked for reamers on line but don't know if what I'm buying is the right size, there is little or no description for them. Can someone tell me what I should look for in buying these tools and where may be the best place to do so? Thanks. Don Back to top Dan Guest Posted: Sun Jan 21, 2007 7:11 am    Post subject: Re: Need Info On Reamers Ed Sullivan wrote: Quote: On 20 Jan 2007 18:40:24 -0800, "DonMorrisey" <donmorrisey (AT) hotmail (DOT) com wrote: I'm trying to figure out how and where to buy reamers. I need to create some 5/8" and 1/2" holes in ultra high molecular weight polyethylene blocks for my control system. The aileron push tubes slide thorugh the blocks and the aileron actuators mount in the blocks as well. The mounting component of my aileron actuator is 5/8", so when buying the .6250" reamer is that already slightly oversized? I have been told the holes should be oversized by .002". I have looked for reamers on line but don't know if what I'm buying is the right size, there is little or no description for them. Can someone tell me what I should look for in buying these tools and where may be the best place to do so? Thanks. Don You might check McMaster-Carr online catalog In Mcmaster look for "oversize reamers." I make model steam engines and buy 99% of my reamers from Mcmaster. Dan, U.S. Air Force, retired Back to top Leon@caspercityauto.com Guest Posted: Sun Jan 21, 2007 7:11 am    Post subject: Re: Need Info On Reamers I'll second the non-use of reamers here. Just drill 'em, and remember you have the choice of numbered, lettered and metric drills to get the size hole you need. Temperature also seems to play a big part in how much spring back you get drilling holes in this kind of material. Experiment ================== Leon McAtee Bob Upp wrote: Quote: You can reference standard drill size "probable oversize" which would apply to holes in metals but I work with black polyethylene parts a lot in my ultra-lights and helicopters and if I used it for your purpose I would just use a 1/32 or 1/64 oversize drill. From my experience a .6250 drill will leave an undersize hole in polyethylene and a reamer would just push polyethylene aside unless the edge is ground and relieved especially for pliable material. Instead of wasting money for reamers I would just drill test holes and then check for the clearances you need. My guess is that a 41/64 drill will give you a probable hole of .6407 inches in aluminum and somewhat less in polyethylene, maybe .630 or so. I suspect the drill speed will effect finish hole size as well and you could experiment for finish hole size this way too. Again, in metals and hole sizes of around 1/2" to 3/4" will be roughly .004 oversize and in plastic probably less. I say drill some test holes and try them out. "DonMorrisey" <donmorrisey (AT) hotmail (DOT) com> wrote in message news:1169347224.730030.302230 (AT) a75g2000cwd (DOT) googlegroups.com... I'm trying to figure out how and where to buy reamers. I need to create some 5/8" and 1/2" holes in ultra high molecular weight polyethylene blocks for my control system. The aileron push tubes slide thorugh the blocks and the aileron actuators mount in the blocks as well. The mounting component of my aileron actuator is 5/8", so when buying the .6250" reamer is that already slightly oversized? I have been told the holes should be oversized by .002". I have looked for reamers on line but don't know if what I'm buying is the right size, there is little or no description for them. Can someone tell me what I should look for in buying these tools and where may be the best place to do so? Thanks. Don Back to top Highflyer Guest Posted: Sun Jan 21, 2007 7:11 am    Post subject: Re: Need Info On Reamers "DonMorrisey" <donmorrisey (AT) hotmail (DOT) com> wrote in message news:1169347224.730030.302230 (AT) a75g2000cwd (DOT) googlegroups.com... Quote: I'm trying to figure out how and where to buy reamers. I need to create some 5/8" and 1/2" holes in ultra high molecular weight polyethylene blocks for my control system. The aileron push tubes slide thorugh the blocks and the aileron actuators mount in the blocks as well. The mounting component of my aileron actuator is 5/8", so when buying the .6250" reamer is that already slightly oversized? I have been told the holes should be oversized by .002". I have looked for reamers on line but don't know if what I'm buying is the right size, there is little or no description for them. Can someone tell me what I should look for in buying these tools and where may be the best place to do so? Thanks. Don Or, if not MacMaster Carr, Check MHC online. ( Manhattan Supply Company ) They do an unbelieveable job of stocking every thing in their catalog. I once ordered a six foot long length of 1 1/4 inch ACME threaded rod, with nuts. It arrived the next day by UPS Ground! Highflyer Highflight Aviation Services Pinckneyville Airport ( PJY ) PS: Note, the Pinckneyville 2007 Flyin is coming up May 18, 19, and 20! Plan now so you don't miss it. Back to top Maxwell Guest Posted: Sun Jan 21, 2007 7:11 am    Post subject: Re: Need Info On Reamers "DonMorrisey" <donmorrisey (AT) hotmail (DOT) com> wrote in message news:1169347224.730030.302230 (AT) a75g2000cwd (DOT) googlegroups.com... Quote: I'm trying to figure out how and where to buy reamers. I need to create some 5/8" and 1/2" holes in ultra high molecular weight polyethylene blocks for my control system. The aileron push tubes slide thorugh the blocks and the aileron actuators mount in the blocks as well. The mounting component of my aileron actuator is 5/8", so when buying the .6250" reamer is that already slightly oversized? I have been told the holes should be oversized by .002". I have looked for reamers on line but don't know if what I'm buying is the right size, there is little or no description for them. Can someone tell me what I should look for in buying these tools and where may be the best place to do so? Thanks. Don You might want to consider adjustable reamers Don. http://wttool.resultspage.com/search?p=Q&ts=custom&uid=956095168&srid=S9-2&nodecode=true&af=&do=search&do=search&w=adjustable+reamers&x=0&y=0 If the long link won't work, just go to http://www.wttool.com/ and do a search on adjustable reamers. Back to top Jerry Wass Guest Posted: Sun Jan 21, 2007 7:11 am    Post subject: Re: Need Info On Reamers DonMorrisey wrote: Quote: I'm trying to figure out how and where to buy reamers. I need to create some 5/8" and 1/2" holes in ultra high molecular weight polyethylene blocks for my control system. The aileron push tubes slide thorugh the blocks and the aileron actuators mount in the blocks as well. The mounting component of my aileron actuator is 5/8", so when buying the .6250" reamer is that already slightly oversized? I have been told the holes should be oversized by .002". I have looked for reamers on line but don't know if what I'm buying is the right size, there is little or no description for them. Can someone tell me what I should look for in buying these tools and where may be the best place to do so? Thanks. Don I'd try drilling the holes with the nominal size drills & then touching them up with some sandpaper on a dowel.. Back to top Guest Posted: Sun Jan 21, 2007 7:11 am    Post subject: Re: Need Info On Reamers DonMorrisey wrote: Quote: I'm trying to figure out how and where to buy reamers. I need to Here is about the best source for reamers: http://www1.mscdirect.com/CGI/NNPDFF?PMPAGE=178&PARTPG=N2DRVSH&PMT4NO=16835364&PMITEM=02239036&PMCTLG=00&PMT4TP=*LTIP You might have to cut and paste to get it to work. Scroll to the bottom of the page and you will find the adjustable reamers. These guys are quick on shipping. There have been times that I have ordered things in the afternoon and had them show up in the morning UPS delivery. If the blocks are very thick, a .002" oversize hole is pretty tight. You will have to make doubly sure that everything is in perfect alignment so that there is no binding of the tube. Craig C. Back to top Ed Sullivan Guest Posted: Sun Jan 21, 2007 7:11 am    Post subject: Re: Need Info On Reamers On 20 Jan 2007 18:40:24 -0800, "DonMorrisey" <donmorrisey (AT) hotmail (DOT) com> wrote: Quote: I'm trying to figure out how and where to buy reamers. I need to create some 5/8" and 1/2" holes in ultra high molecular weight polyethylene blocks for my control system. The aileron push tubes slide thorugh the blocks and the aileron actuators mount in the blocks as well. The mounting component of my aileron actuator is 5/8", so when buying the .6250" reamer is that already slightly oversized? I have been told the holes should be oversized by .002". I have looked for reamers on line but don't know if what I'm buying is the right size, there is little or no description for them. Can someone tell me what I should look for in buying these tools and where may be the best place to do so? Thanks. Don You might check McMaster-Carr online catalog Back to top Bob Upp Guest Posted: Sun Jan 21, 2007 7:11 am    Post subject: Re: Need Info On Reamers You can reference standard drill size "probable oversize" which would apply to holes in metals but I work with black polyethylene parts a lot in my ultra-lights and helicopters and if I used it for your purpose I would just use a 1/32 or 1/64 oversize drill. From my experience a .6250 drill will leave an undersize hole in polyethylene and a reamer would just push polyethylene aside unless the edge is ground and relieved especially for pliable material. Instead of wasting money for reamers I would just drill test holes and then check for the clearances you need. My guess is that a 41/64 drill will give you a probable hole of .6407 inches in aluminum and somewhat less in polyethylene, maybe .630 or so. I suspect the drill speed will effect finish hole size as well and you could experiment for finish hole size this way too. Again, in metals and hole sizes of around 1/2" to 3/4" will be roughly ..004 oversize and in plastic probably less. I say drill some test holes and try them out. "DonMorrisey" <donmorrisey (AT) hotmail (DOT) com> wrote in message news:1169347224.730030.302230 (AT) a75g2000cwd (DOT) googlegroups.com... Quote: I'm trying to figure out how and where to buy reamers. I need to create some 5/8" and 1/2" holes in ultra high molecular weight polyethylene blocks for my control system. The aileron push tubes slide thorugh the blocks and the aileron actuators mount in the blocks as well. The mounting component of my aileron actuator is 5/8", so when buying the .6250" reamer is that already slightly oversized? I have been told the holes should be oversized by .002". I have looked for reamers on line but don't know if what I'm buying is the right size, there is little or no description for them. Can someone tell me what I should look for in buying these tools and where may be the best place to do so? Thanks. Don Back to top Richard Riley Guest Posted: Sun Jan 21, 2007 10:41 pm    Post subject: Re: Need Info On Reamers On 20 Jan 2007 18:40:24 -0800, "DonMorrisey" <donmorrisey (AT) hotmail (DOT) com> wrote: I think all the advice here is good (even though some of it is contradictory). McMaster is great to deal with. I'm lucky enough to have one of their distribution centers within driving distance, about 30 miles away. It was a surprise the first time I ordered and it wouldn't give me any shipping option but "overnight courier" - I didn't need it fast, and figured that would cost a fortune. It turned out they used a small delivery service for local stuff that's cheaper than the post office - and even though I ordered at 1pm, it was there before I went home. Whatever method you use to make the hole, try to have extra material available. It's cheap enough, and the "rebound" in UHMW is hard to predict. Back to top Capt. Geoffrey Thorpe Guest Posted: Mon Jan 22, 2007 2:10 am    Post subject: Re: Need Info On Reamers "GeorgeB" <nospam (AT) att (DOT) net> wrote in message news:k4o6r2pu29jdq71mk91c518rkh5iku3es2 (AT) 4ax (DOT) com... Quote: On 20 Jan 2007 18:40:24 -0800, "DonMorrisey" <donmorrisey (AT) hotmail (DOT) com wrote: ... little oversize. Remember that the expansion of materials is different, binding would not be a good thing. Would you then suggest that it would be a good idea to test the fit of the sample parts after the plastic and aluminum have spent the night in the deep-freeze and again after a couple hours in a 150 F. oven (about how hot it can get with the sun beating on a closed structure?)? -- Geoff The Sea Hawk at Wow Way d0t Com remove spaces and make the obvious substitutions to reply by mail When immigration is outlawed, only outlaws will immigrate. Back to top Philippe Vessaire Guest Posted: Mon Jan 22, 2007 2:29 am    Post subject: Re: Need Info On Reamers DonMorrisey wrote: Quote: I'm trying to figure out how and where to buy reamers. I need to create some 5/8" and 1/2" holes in ultra high molecular weight polyethylene blocks for my control system. The aileron push tubes slide thorugh the blocks and the aileron actuators mount in the blocks as well. The mounting component of my aileron actuator is 5/8", so when buying the .6250" reamer is that already slightly oversized? I have been told the holes should be oversized by .002". I have looked for reamers on line but don't know if what I'm buying is the right size, there is little or no description for them. Remember polyethylene blocks may creep under load. You need some clearance between hole and tube. I don't think you kneed to buy a reamer, a new drill will do the job with proper clearance. By -- Pub: http://www.slowfood.fr/france Philippe Vessaire Ò¿Ó¬ philippe.vessaireNO (AT) SPAMtele2 (DOT) fr Back to top Morgans Guest Posted: Mon Jan 22, 2007 2:58 am    Post subject: Re: Need Info On Reamers "Philippe Vessaire" <ailleurs (AT) No (DOT) Spam> wrote Quote: Remember polyethylene blocks may creep under load. You need some clearance between hole and tube. I don't think you kneed to buy a reamer, a new drill will do the job with proper clearance. To OP: was there a +/- type of allowable clearance given, as a recommended range? It would seem like a necessary range of fits would have to be given. As this poster pointed out, the coefficients of expansion for these two different materials would be wildly different, and the clearances would have to change for the temperature spread an aircraft would be subjected to. I agree that a freezer/oven test needs to happen, and clearances measured, or at least calculated clearances for the different temperatures. Anyone got a favorite source for materials expansion coefficients? -- Jim in NC Back to top DonMorrisey Guest Posted: Mon Jan 22, 2007 3:21 am    Post subject: Re: Need Info On Reamers Quote: To OP: was there a +/- type of allowable clearance given, as a recommended range? Jim, it was suggested that I oversize the hole by .002. There is great information in this post and I thank everyone for contributing. Don. Back to top Bill Daniels Guest Posted: Mon Jan 22, 2007 3:32 am    Post subject: Re: Need Info On Reamers I have had great results drilling UHMWPE with wood workers Forstner bits. Just as with wood, these bits cut holes with very straight, smooth sides in UHMWPE. OTOH, metal twist drills tend to push material aside which then rebounds to make the hole smaller than the nominal size of the drill. I replaced the nylon pushrod fairleads in my sailplane with UHMWPE using Forstner bits to drill the holes slightly bigger than the pushrod OD. Bill Daniels "DonMorrisey" <donmorrisey (AT) hotmail (DOT) com> wrote in message news:1169414476.261635.132900 (AT) v45g2000cwv (DOT) googlegroups.com... Quote: To OP: was there a +/- type of allowable clearance given, as a recommended range? Jim, it was suggested that I oversize the hole by .002. There is great information in this post and I thank everyone for contributing. Don. Back to top Display posts from previous: All Posts1 Day7 Days2 Weeks1 Month3 Months6 Months1 Year Oldest FirstNewest First         AirTalk.org Forum Index -> Aircraft Design & Building All times are GMT Goto page 1, 2, 3  Next Page 1 of 3   Jump to: Select a forum Aviation----------------alt.aviationAviation safety EnhancementPlanes, gliders and flying in AustraliaAviation et pilotage (Français)rec.aviationAviation (Aerobatics)Hot air, gas balloons and airshipsHang-gliding, paragliding, foot-launched flightAircraft Design & BuildingInstrument Flight RulesAviation (Classifieds)Military AircraftNaval AviationAviation (Miscellaneous Topics)Owning AirplanesAviators (General Discussions)Aviation related productsAircraft RestorationHelicopters and rotary wing aircraftsFlight SimulationSailplanesAviation (Students)Light aircraftFlying related activities in the UK Airports----------------alt.airportsEdinburgh Airport Glasgow Airport Humberside Airport Luton Airport Aberdeen Airport Glasgow Prestwick Airport  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 Powered by phpBB © 2001, 2006 phpBB Group SEO toolkit © 2004-2006 webmedic.