Ive used flap wheels ( wear out tooo fast) and grinding stones make a damn mess and are not fast..

Any recommendations? I have an entire chassis of welds to grind down!

TIA

 

by grinding stone you mean a grinding disc right? that, a weldbuster or a flap disc which i like the most, are really your only options, fun ain't it?

if you have an air sander, some 24 grit open coat works ok, but a closed coat is the way to go

 

If your grinding down welds on the construction of a chassis, dont expect it to pass certification...at least not in NHRA. If a chassis is full welds that have been ground down, it will automatically fail. Just something to think about....
Kyle

 

This isnt drag racing and it has to be ground because its square tubing with an aluminum skin.. The skin would look like **** if it wasnt!

I'm only grinding one side!

 

What the heck are you building? got pics?

 

3M makes a line of wheels called "Cut & Polish" wheels. They come in different grits. You can grind a weld down to almost a mirror finish with them.

 

I find that cutting disc work great. Use the bottom of them not the side though. They work a lot better then a grinding disc and if you get the right disc, it can last pretty long.

 

I would use some decent grinding wheels with an angle grinder at first, then get them down more with some flexbile sanding pads, or other flexible abrasive material. while you are in there, double check all the welds and verfy all are good, and use this time to fix any that might have holes or other impurities.

 

Grinding wheels take a lot longer then a cutting disc. Just use the bottom, I'm telling you its great to grind down welds.

I find grinding disc like to over heat the metal and it really takes a long time for the grinding wheel to grind down the welds

 

What flap discs are you using? I use 60 grit Zirconia and they rip right through the welds. Grinding discs make too much heat if you try to cut fast.

 

the best thing to do is not not put down big welds to start with..and you won't have much to grind down. If you TIG weld it, or are smooth with a MIG, you may not even need to grind them down.

I've always figured that gringind down a weld is like taking a step forward, and one back....you're taking back what you just did.

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by Engloid &raquo;</TD></TR><TR><TD CLASS="quote">the best thing to do is not not put down big welds to start with..and you won't have much to grind down. If you TIG weld it, or are smooth with a MIG, you may not even need to grind them down.

I've always figured that gringind down a weld is like taking a step forward, and one back....you're taking back what you just did.</TD></TR></TABLE>

I agree but Its easier to weld on the outside (MIG) and then grind it down after youve fully welded the chassis.. Its not much to grind down per joint but all together its a good bit of work!