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Thread: Bottle stoppers
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31st December 2023, 07:58 PM #1
Bottle stoppers
I am wanting to make some of the bottle stoppers that use the 1/4" or 8mm threads to screw into the wooden blank. I am having trouble when tapping the thread where the wood is stripping out leaving little or no thread. I am using taps that are like new so not blunt. What do others do when tapping threads in wood to produce good fitting solid threads? I have had success in the past threading really solid woods but problems occur as soon as I move away from them.
Dallas
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31st December 2023 07:58 PM # ADSGoogle Adsense Advertisement
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31st December 2023, 08:17 PM #2
Dallas, are you "strengthening" the threads with thin CA after cutting?
What TPI is the 1/4", 20 or 24 or 28. Coarser threads work better in timber.
What pilot hole size are you using? In wood generally, you have to use a smaller hole than in metal, 1/4" normally you would use a 5mm drill bit, I would go to a 5.5mm bit and chamfer the top of the hole.
I use 3/8 nub bottle stoppers and have the Ruth Niles mandrel etc.
I got them before postage became ridiculous.Pat
Work is a necessary evil to be avoided. Mark Twain
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31st December 2023, 09:00 PM #3
Yes Pat, I try adding CA after the thread is cut and sometimes there is enough thread left that they will hold and other times not.
The 1/4" threads are 20 TPI and I have tried the recommended drill size of 5.1mm and also the next size down of 3/16" with the same results. I have been filling the stripped thread holes with epoxy and redrilling and tapping but I'm sure not everyone has to go to that trouble.
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1st January 2024, 01:05 AM #4China
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In my experience ( I have made hundreds ) it depends largely on the timber being used, dense timber threads with better results as said above you need a much smaller drill than for steel, take it slow, once made I always put Epoxy on the thread when assembling.
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1st January 2024, 08:46 AM #5
I agree with the comments, timber species, hole dimensions etc are very important, my preference is always hardwood and generally the hardest I have. The only other idea I can think of is if the timber you prefer isnt ideal for the thread cutting. Then try adding CA to the hole you intend to tap before tapping,ie coat the walls and give it what ever time it needs to completely dry. Also take it easy with tapping slow and easy is the way, I would avoid end grain unless its hard wood. Good luck.
Inspiration exists, but it has to find you working. — Pablo Picasso
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1st January 2024, 09:32 AM #6
Thanks all, there are a few ideas in there that I can pursue that are slightly different to what I have been doing.
Dallas
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1st January 2024, 07:57 PM #7Intermediate Member
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I used to have the same problem but eliminated it by using a 5.5 mm drill bit for the pilot hole. Previously I was using 5mm.
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6th January 2024, 07:26 PM #8GOLD MEMBER
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I use a dab of mineral oil on the tap, I use the tap in cordless drill and pre drill about twice the depth needed.
Previously I wasn't drilling deep enough and would strip the the thread I was cutting.Turning round since 1992
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