New BassChat 8"Cab design

[Stub Mandrel]

7 hours ago, tauzero said:

Whose sister Carol did such a magnificent job of singing for T'Pau

 

Who can forget Carol Black?

Edited November 4 by Stub Mandrel

[rwillett]

As it's raining, I thought I'd look at speaker corners. I brought some from a supplier and they are thin and weedy. So thought I'd design some of my own.

 

Also the front of the speaker is slightly different to the rear of the speaker and a different design would benefit here as the baffle is recessed.

 

The back speaker corners are more traditional

 

These are all 5mm thick and around 60mm x 60mm. Other sizes may be done if enough interest. Mmmm.... after looking at the still printing one, 60x60mm may be too big. Its chunky

 

Happy to print them out for free for a suitable donation to the North West Air Ambulance. 

 

I'll post pictures when they are on the speaker.

 

Thanks

 

Rob

Edited November 4 by rwillett

[martin8708]

Baffle cut and cab screwed together,( will glue and screw when happy everything fits ) 

Back panel cut , just need to wait for when the neighbours are out to check for any buzzing or rattles .

[rwillett]

I've just looked at the plans again as something was bothering me.

 

I was wondering why the 274mm measurements on the sides and top and bottom aren't 276mm to make cutting easier. Changing that measurement to 276mm merely extends out the front pieces beyond the baffle by 2mm so it's 12mm rather than 10mm. It has no impact on the volume but it means all pieces can be cut from a strips of ply 276mm wide. I think it also saves at least one cut and possibly two. No more fiddling with a 2mm difference.There are a number of different ways to cut it out of a sheet 1440 x 660mm.My topology skills are limited so I couldn't work out all the permutations. Anything that simplifies things seems a good idea to me.

 

 

I'm sure I have this wrong but where have I misunderstood?

 

Thanks

 

Rob

Edited Sunday at 10:23 by rwillett

[Bassybert]

You haven’t got it wrong Rob it’s something @stevie picked up on back when I put the pdf together from Phil’s design. 
 

@Phil Starr It’s not a problem for me to update the designs to make all cutting widths the same if you’re ok with that?

[Stub Mandrel]

57 minutes ago, Bassybert said:

You haven’t got it wrong Rob it’s something @stevie picked up on back when I put the pdf together from Phil’s design. 
 

@Phil Starr It’s not a problem for me to update the designs to make all cutting widths the same if you’re ok with that?

 

I thought there would be a clever explanation about allowing for the width of the sawcut 😁

[Phil Starr]

20 hours ago, Bassybert said:

You haven’t got it wrong Rob it’s something @stevie picked up on back when I put the pdf together from Phil’s design. 
 

@Phil Starr It’s not a problem for me to update the designs to make all cutting widths the same if you’re ok with that?

Let's do that then, once I have that I can amend the earlier posts. and I can put @rwillett's cutting list up under the plans. 

 

Thanks guys, it's why I like it when somebody builds the plans. It's the little details that make it easier for other people to follow and once a few people have completed the build you do spot little errors. 

[Phil Starr]

BTW I demo'd six cabs at the SE Bass Bash yesterday all running off PA amps set flat and adjusted so the levels were the same. The 1x8 was a clear winner repeating the performance at the SW Bass Bash.

Edited yesterday at 08:25 by Phil Starr

[rwillett]

7 minutes ago, Phil Starr said:

Let's do that then, once I have that I can amend the earlier posts. and I can put @rwillett's cutting list up under the plans. 

 

Thanks guys, it's why I like it when somebody builds the plans. It's the little details that make it easier for other people to follow and once a few people have completed the build you do spot little errors. 

 

I'll redo my quick cutting list so it's a little clearer and tidier.

 

@Bassybert how do you want to incorporate a suggested cut list? I can send you it it in Fusion 360 or I can try and find something else. There are a number of ways to cut and if you have a long cutting guide rail, that's one way and a short cutting  guide rail a different way. 

 

Or 

 

Should I just create a separate PDF with my ideas in? Not fussed either way. 

 

Rob

Edited yesterday at 08:29 by rwillett

[rwillett]

3 minutes ago, Phil Starr said:

BTW I demo'd six cabs at the SE Bass Bash yesterday all running off PA amps set flat and adjusted so the levels were the same. The 1x8 was a clear winner repeating the performance at the SW Bass Bash.

 

So if I build two cabs they're twice as good 😊?

[Phil Starr]

1 minute ago, rwillett said:

 

I'll redo my quick cutting list so it's a little clearer and tidier.

 

@Bassybert how do you want to incorporate a suggested cut list? I can send you it it in Fusion 360 or I can try and find something else. There are a number of ways to cut and if you have a long cutting guide rail, that's one way and a short cutting  guide rail a different way. 

 

Rob

Can I suggest you choose the way that uses fewest cuts. That'll make it easier for people going to B&Q or a timber merchants for cutting.

[rwillett]

Just now, Phil Starr said:

Can I suggest you choose the way that uses fewest cuts. That'll make it easier for people going to B&Q or a timber merchants for cutting.

 

That sounds sensible. 

[Phil Starr]

Just now, rwillett said:

 

So if I build two cabs they're twice as good 😊?

Seriously, I think you'd have a workable gigging rig. I've been using mine at rehearsals with a real drummer and in quite a big hall it works well. Potentially you'd have 6db louder than that so yes that would be good

[Phil Starr]

I should probably go, I'm supposed to be practicing for tomorow's rehearsal

[Bassybert]

5 hours ago, rwillett said:

 

I'll redo my quick cutting list so it's a little clearer and tidier.

 

@Bassybert how do you want to incorporate a suggested cut list? I can send you it it in Fusion 360 or I can try and find something else. There are a number of ways to cut and if you have a long cutting guide rail, that's one way and a short cutting  guide rail a different way. 

 

Or 

 

Should I just create a separate PDF with my ideas in? Not fussed either way. 

 

Rob

Hi Rob I’d like to add the cutting list to the main pdf if possible?

[rwillett]

4 minutes ago, Bassybert said:

Hi Rob I’d like to add the cutting list to the main pdf if possible?

OK. Let's speak off line and work out how to it technically as this may bore people 😊

[rwillett]

As I'm an idiot I pasted this in the wrong chat. This is one way to cut a sheet of plywood down from 1440 x 660 for pieces for the 8" Basschat speaker. There are others but this does it in six cuts if you can stack the pieces, click on it to expand.

 

 

If you have your own guide rail BUT it's not 1.3m long, you can also use cut 3 first, then cut 4, place them on top of each other to do cut 1. Still the same number of cuts.  Apparently my circular saw will do 66mm of cuts with the blade at 90 degrees. It's a relatively cheap Makita (for Makita) https://amzn.eu/d/j6vA5Sf My guide is only 1m long so I do the same cut pattern as @tauzero. Your local timber merchant may have their own way to cut this. my local one has a sign adjacent to the very large table saw, saying this is highly dangerous equipment and under no circumstances tell the operator how to do his job

 

So 24mm of plywood should be no problem and neither should 36mm of plywood (mmmmm...). It has an 80 tooth wheel on so it does very nice fine cuts and I have absolutely no idea if that makes a difference or not on the depth. If anybody can say for certain it's OK to cut 36mm of plywood without it destroying the 80T blade or motor?

 

I'll have try when the weather gets better. Currently we appear to be doing our best to emulate Noah's flood in North Yorkshire. One day of decent weather and two weeks of rain and another week forecast. My poor dog never seems to have enough time to get dry from each walk

 

Edited 1 hour ago by rwillett