First THTLP - First Bill F. project

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kbaxreno
Posts: 14
Joined: Mon Mar 18, 2013 12:36 pm

First THTLP - First Bill F. project

#1 Post by kbaxreno »

Starting my first BF speaker. THTLP. 18" by 24". I got my photos out of order. This post should be second.
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I pre drilled the ends to help with setup.
I pre drilled the ends to help with setup.
I usually make a mess with this stuff.
I usually make a mess with this stuff.
Glued and braced. That's all for today, I am in about 3.5 hours
Glued and braced. That's all for today, I am in about 3.5 hours
The dog never figures out that we can only hunt a few months each year.
The dog never figures out that we can only hunt a few months each year.
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kbaxreno
Posts: 14
Joined: Mon Mar 18, 2013 12:36 pm

Re: First THTLP - First Bill F. project

#2 Post by kbaxreno »

Starting my first BF speaker. THTLP. 18" by 24". This post should be first.
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Marking the layout on the first panel. Now I'm committed.
Marking the layout on the first panel. Now I'm committed.
When I clamped the sides together to transfer lines I noticed one board a bit big. I screwed them together and cleaned up.
When I clamped the sides together to transfer lines I noticed one board a bit big. I screwed them together and cleaned up.
I found differentiating the 1/16" holes difficult when transferring between panels so I marked each set with a different symbol.
I found differentiating the 1/16" holes difficult when transferring between panels so I marked each set with a different symbol.
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Chris_Allen
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Joined: Wed Jul 11, 2007 2:43 pm
Location: Huddersfield, UK

Re: First THTLP - First Bill F. project

#3 Post by Chris_Allen »

I often forget how big the THTLP is!

Have you built any other cabs before?
Built:
6xDR200, 2xT39, 2xT48, 2xJack110, 1xOmni10.5, 1xAutotuba, 1xT18, 1xSLA Pro, 1xW8, 1xW10
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kbaxreno
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Joined: Mon Mar 18, 2013 12:36 pm

Re: First THTLP - First Bill F. project

#4 Post by kbaxreno »

I have built other things, but I just got the DIY speaker bug and this is my first one.
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kbaxreno
Posts: 14
Joined: Mon Mar 18, 2013 12:36 pm

Re: First THTLP - First Bill F. project

#5 Post by kbaxreno »

Does anyone have some advice on T-nuts? Bill's instructions call for machine screws, lock washers and nuts. If I am understanding the plans correctly, then there would be no way to get the driver out after cabinet was completed. I found locking Image and high strength Image T-nuts at McMaster-Carr. http://www.mcmaster.com/#tee-nut-inserts/=n4czmc Would they work and allow me to remove driver if needed?

BTW, the mounting holes on the driver are 6.35 mm / .250 inch.


Ken
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Bill Fitzmaurice
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Re: First THTLP - First Bill F. project

#6 Post by Bill Fitzmaurice »

kbaxreno wrote:Does anyone have some advice on T-nuts? Bill's instructions call for machine screws, lock washers and nuts.
Not my copy. :confused:
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Grant Bunter
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Re: First THTLP - First Bill F. project

#7 Post by Grant Bunter »

Advice on T nuts:

I would have posted a link to the thread from Harley about putting them in, but can't find it!

Make sure they are installed square to the hole, with epoxy underneath. Also insert one small screw into the space between prongs to prevent them from ever spinning.
After the epoxy is set, chase the threads with appropriate sized tap to ensure the threads are clear...

Hope this helps
Built:
DR 250: x 2 melded array, 2x CD horn, March 2012 plans.
T39's: 4 x 20" KL3010LF , 2 x 28" 3012LF.
WH8: x 6 with melded array wired series/parallel.
Bunter's Audio and Lighting "like"s would be most appreciated...
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fester
Posts: 132
Joined: Sun May 22, 2011 5:51 am
Location: Auckland, NooZilund

Re: First THTLP - First Bill F. project

#8 Post by fester »

'lock washers' and 'lock nuts' are two different things... you just want normal t-nuts not locking ones... but you do want lock washers, which are washers with teeth on them to help the bolt bite in and not move at full tension.
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Bill Fitzmaurice
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Re: First THTLP - First Bill F. project

#9 Post by Bill Fitzmaurice »

fester wrote:'lock washers' and 'lock nuts' are two different things... you just want normal t-nuts not locking ones... but you do want lock washers, which are washers with teeth on them to help the bolt bite in and not move at full tension.
Follow the plans and use screws. TNuts are a PITA as they have a tendency to strip and cross-thread far too easily.
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fester
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Location: Auckland, NooZilund

Re: First THTLP - First Bill F. project

#10 Post by fester »

so true about the threading... thats what just happened to me yesterday!! arg, pain in the butt
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kbaxreno
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Joined: Mon Mar 18, 2013 12:36 pm

Re: First THTLP - First Bill F. project

#11 Post by kbaxreno »

OK, so sometimes what I read is not the same as what is printed on the page... Bill's plans refer to allen head screws and lock washers. I read machine screws and nuts. Wood screws and lock washers sound much simpler.
I installed a couple more panels on Sunday.
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Couple more steps done today.
Couple more steps done today.
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kbaxreno
Posts: 14
Joined: Mon Mar 18, 2013 12:36 pm

Re: First THTLP - First Bill F. project

#12 Post by kbaxreno »

Hello all. I got the baffle and the braces behind it installed today. Had to wait on the driver to arrive to measure it properly. I have a question on mounting the driver. The gasket around the driver is like 1/2 - 5/8 thick. How much do I compress that when I install the driver?

Ken
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Harley
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Location: Christchurch, New Zealand - Authorised BFM Cab Builder

Re: First THTLP - First Bill F. project

#13 Post by Harley »

kbaxreno wrote:Does anyone have some advice on T-nuts? Bill's instructions call for machine screws, lock washers and nuts.
Not Bill Fitzmaurice's, but Harley Maurice's :mrgreen:

http://billfitzmaurice.info/forum/viewt ... 14&t=18206
ImageSemi-retired: Former Australia and New Zealand Authorised BFM cab builder.
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DJPhatman
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Re: First THTLP - First Bill F. project

#14 Post by DJPhatman »

kbaxreno wrote:Hello all. I got the baffle and the braces behind it installed today. Had to wait on the driver to arrive to measure it properly. I have a question on mounting the driver. The gasket around the driver is like 1/2 - 5/8 thick. How much do I compress that when I install the driver?

Ken
Compress the gasket enough to get an air-tight seal. Sanding the surface smooth where the gasket touches the baffle wood will go further towards a non-leaking gasket then over-tightening will.
I know money often seals the deal, but seriously, quality is an investment, not an expense... Grant Bunter
Accept the fact that airtight and well-braced are more important than pretty on the inside. Bill Fitzmaurice
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subharmonic
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Location: Mandan ND

Re: First THTLP - First Bill F. project

#15 Post by subharmonic »

Why did I never think of that!
2x T39, 1x T60, 1x THTLP, 1x AT(not built by me) 6x DR250
I need more bass

But this gal's built like a burlap bag full of bobcats
CW Mcall
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