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plexiglass, cutting, tapping threads?


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Alpine Guy 
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Posted: December 06, 2006 at 5:39 PM / IP Logged  
Can you tap threads into plexi glass?
And how many tooth saw blade should i use in my table saw to cut the plexi???
2003 Chevy Avalanche,Eclipse CD7000,Morel Elate 5,Adire Extremis,Alpine PDX-4.150, 15" TC-3000, 2 Alpine PDX-1.1000, 470Amp HO Alt.
realitycheck 
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Posted: December 07, 2006 at 10:26 AM / IP Logged  

I typed in tap thread plexiglass on google and this link came up with this information,     The steel tap will be corroded but not the part. Due to stretching, nylon, plexiglass & teflon typically end up with very tight threads when tapped. ...

If you go to the website you have to sign up to read there stuff but it looks like you can tap the plexi I would think so its hard enough to be threaded and pretty much hold it as long as your careful not to overtighten.
This link has some info on cutting it http://www.homeownerschat.com/227280-Cutting-Plexiglass.htm

Learning the trade one fiberglass creation at a time!
Custom_Jim 
Copper - Posts: 199
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Posted: December 07, 2006 at 11:00 AM / IP Logged  

Alpine Guy wrote:
Can you tap threads into plexi glass?
And how many tooth saw blade should i use in my table saw to cut the plexi???

Yes you can. Use the proper sized bit for the tap and then thread the tap in some, back it all the way out and clean off the tap and then rethread it in, cut  another two or three threads, take it out, clean and repeat. Taps also come in bottoming style and one thing I've learned is to use this style last to get the bottom tapped and threaded. These are not meant (or are harder to start) than the starting taps.

Also, make sure you drill the pilot hole deep enough because once you start threading the hole you cannot make the hole deeper without messing up the threads you've already created.

I did a windshiled on an old Henry J race car and I used 1/4" NC bolts threaded into 1/2" plexiglass and it's been holding up just fine.

When I cut plexiglass or Lexan I try and get 1.5 to 2 teeth hitting the edge I'm cutting. Too many teeth and it melts together on the backside of the cut, to few and it chips. Alwyas try your setup on some scrap.

Jim

1968 Chevy II Nova Garage Find 2012
1973 Nova Custom
1974 Spirit of America Nova
1973 Nova Pro-Street
Alpine Guy 
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Posted: December 07, 2006 at 12:22 PM / IP Logged  
Wow thanks guys, I searched this stuff too and didn't find anything, thats why i come here i guess :)
I guess a 120 tooth 10" saw blade would suffice?
2003 Chevy Avalanche,Eclipse CD7000,Morel Elate 5,Adire Extremis,Alpine PDX-4.150, 15" TC-3000, 2 Alpine PDX-1.1000, 470Amp HO Alt.
Custom_Jim 
Copper - Posts: 199
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Posted: December 07, 2006 at 1:37 PM / IP Logged  

I know when I was getting glass cut from Cope Platics here in Saint Louis, they had a blade on a table saw but I couldn't tell if it was special or what. It might have to do with the tooth count or how the cutting tips are set up.

Jim

1968 Chevy II Nova Garage Find 2012
1973 Nova Custom
1974 Spirit of America Nova
1973 Nova Pro-Street
maliboom 
Copper - Posts: 111
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Joined: October 27, 2006
Location: Canada
Posted: December 07, 2006 at 6:49 PM / IP Logged  
100 tooth 10" blade is what I use and there's no problems with melting untill 1/2 inch thick plexi. Also I found that puting 2 layers of masking tape on the plexi will help stop the chipping while its being cut.  Threading is just as easy as Custom-Jim wrote, if you follow those instructions tapping will be easy.
Alpine Guy 
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Posted: December 07, 2006 at 8:20 PM / IP Logged  
perfect :) I'll pick up a tap and saw blade tomorrow, i'll post pic's of my little project for school. Im building a linear DC power supply out of plexi glass everything made from hand right down to the printed circut board :) Dam i love electronics lol
2003 Chevy Avalanche,Eclipse CD7000,Morel Elate 5,Adire Extremis,Alpine PDX-4.150, 15" TC-3000, 2 Alpine PDX-1.1000, 470Amp HO Alt.
Custom_Jim 
Copper - Posts: 199
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Joined: November 28, 2003
Location: Missouri, United States
Posted: December 09, 2006 at 8:54 PM / IP Logged  

Here's some shots of a windshield I put together on an old Henry J race car:

http://rides.webshots.com/photo/2736523590049730488raHeeb

http://rides.webshots.com/photo/2113299880049730488ltQwhl

I took my time with trying a test panel first so I could get the original hole drilled down just enough with thread almost to the bottom so it looked the best.

Jim

1968 Chevy II Nova Garage Find 2012
1973 Nova Custom
1974 Spirit of America Nova
1973 Nova Pro-Street

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