Rivet sizes

[SauRoNZA]

Actually you do get them. https://www.builders.co.za/search?q=rivets:relevance:125:Washers

Protects the perspex on the blind side, or where the rivet expands.

No no didn’t mean you don’t get them, I’m just not sure what their purpose would be in the case of Perspex specifically.

Now if it was the kind that has a sleeve attached that makes more sense to me, but then I’m not sure that would hold in place with a rivet.

The rivet expands sideways and then pops out the top after when it meets resistance so there is no “blind” side to protect. It’s the actual drill hole that would split and not the top part where the rivet flattens.

But then I’ve not done this personally so not speaking from (perspex) experience just thinking about how it would work logically.

Have had my fair share of pain and trauma removing and replacing titanium rivets in carbon fibre though which didn’t need washers .

What are you building? Sound interesting.

 

[Swa]

No no didn’t mean you don’t get them, I’m just not sure what their purpose would be in the case of Perspex specifically.

Now if it was the kind that has a sleeve attached that makes more sense to me, but then I’m not sure that would hold in place with a rivet.

The rivet expands sideways and then pops out the top after when it meets resistance so there is no “blind” side to protect. It’s the actual drill hole that would split and not the top part where the rivet flattens.

But then I’ve not done this personally so not speaking from (perspex) experience just thinking about how it would work logically.

Have had my fair share of pain and trauma removing and replacing titanium rivets in carbon fibre though which didn’t need washers .

What are you building? Sound interesting.

The blind side is the side where it expands till it pops off. Called the blind side because you don't need access to this side and only the side you insert it from. The rivets also being called blind rivets for this reason.

What usually happens is it expands till it encounters resistance from the hole. In the case of soft materials this may not happen and it goes right through the hole or breaks the material. The washer prevents that as it pops right off as soon as it encounters it, or in theory at least. You insert it at that side and not the same side you insert the rivet from with flat head. It's not the pressure really that can break the perspex but more the expansion of the rivet.

A computer case. Been in storage for years and will probably take another year to finish.

 

[SauRoNZA]

The blind side is the side where it expands till it pops off. Called the blind side because you don't need access to this side and only the side you insert it from. The rivets also being called blind rivets for this reason.

What usually happens is it expands till it encounters resistance from the hole. In the case of soft materials this may not happen and it goes right through the hole or breaks the material. The washer prevents that as it pops right off as soon as it encounters it, or in theory at least. You insert it at that side and not the same side you insert the rivet from with flat head. It's not the pressure really that can break the perspex but more the expansion of the rivet.

A computer case. Been in storage for years and will probably take another year to finish.

Aah right would make sense if the washer is ever so slightly smaller or exact same size as the Perspex hole itself and is in effect a sleeve then like I figured earlier, so it never actually pushes up the Perspex hole itself.

 

[Geoff.D]

All very tricky when using anything like a perspex or other brittle plastics. The rivet washer is only useful if you can get to both sides of the job as its function is to spread the force over a larger area of the "soft" or brittle material, thus preventing point forces which will trigger cracks.
Tried it once and ended up protecting the brittle material with a thin aluminium strip instead.
Hence why if this is crucial job where a good seal or good looks is very important, special rivets should be used. Some examples in the attachment I posted.
Getting the right sized drills is a problem. I found them at a tool shop and they are stored and used for special jobs only.
Rivco stocks the drills as well, but it is hit and miss if they have when you buy. The best Rivco depot in the country is the one in CT, followed by PE. The GP outlet has always disappointed me.

 

[Swa]

All very tricky when using anything like a perspex or other brittle plastics. The rivet washer is only useful if you can get to both sides of the job as its function is to spread the force over a larger area of the "soft" or brittle material, thus preventing point forces which will trigger cracks.
Tried it once and ended up protecting the brittle material with a thin aluminium strip instead.
Hence why if this is crucial job where a good seal or good looks is very important, special rivets should be used. Some examples in the attachment I posted.
Getting the right sized drills is a problem. I found them at a tool shop and they are stored and used for special jobs only.
Rivco stocks the drills as well, but it is hit and miss if they have when you buy. The best Rivco depot in the country is the one in CT, followed by PE. The GP outlet has always disappointed me.

Using an aluminium strip is a good idea. I have an angle bar on the outside but finding the correct size aluminium is rather a pita as few dealers stock it.

 

[upup]

Aah right would make sense if the washer is ever so slightly smaller or exact same size as the Perspex hole itself and is in effect a sleeve then like I figured earlier, so it never actually pushes up the Perspex hole itself.

The once I got long time ago are usually very thick comparison to normal washers.

Also you get 2 pop rivets, one with a hole and one without a hole.

 

[Swa]

The once I got long time ago are usually very thick comparison to normal washers.

Also you get 2 pop rivets, one with a hole and one without a hole.

Can you explain this part?

 

[upup]

Can you explain this part?

 

[Geoff.D]

Can you explain this part?

Did you see my post on RIVCO? Everything you ever wanted to know about rivets? Post #15