Rotary bogs after 3 passes!

distrbd

distrbd

all in the details
I recently bought a cheap rotary to practise on my son's black car and to learn how to use "rotary",but this machine only has two speeds 1800 rpm & 3600 rpm ,no in between speed settings.
Today I tried to remove some swirl marks with a finishing pad and SSR 2.5 but after 3 passes on the hood the machine starts to bog , then jump .
I did put enough polish and tried less pressure ,it continued to bog.
Changing to polishing pad didn't help,I know I'm a newbie but it felt like I was doing it right but the speed was too high,could it be the reason for bogging?
Shouldn't I start with 600 rpm and after a few passes bump the speed to 1000 RPM or 1200 rpm max?
could you tell me where I'm going wrong?
Thanks for your help.
Ken.
 
distrbd said:
I recently bought a cheap rotary to practise on my son's black car and to learn how to use "rotary",but this machine only has two speeds 1800 rpm & 3600 rpm ,no in between speed settings.
Today I tried to remove some swirl marks with a finishing pad and SSR 2.5 but after 3 passes on the hood the machine starts to bog , then jump .
I did put enough polish and tried less pressure ,it continued to bog.
Changing to polishing pad didn't help,I know I'm a newbie but it felt like I was doing it right but the speed was too high,could it be the reason for bogging?
Shouldn't I start with 600 rpm and after a few passes bump the speed to 1000 RPM or 1200 rpm max?
could you tell me where I'm going wrong?
Thanks for your help.
Ken.
Click to expand...

I normally start off slower with my rotary unfortunately mine only starts at 1000rpms. 600 is fine if you want to get the pad going or your applying a lsp. However if you want to start correction your going to have to venture into above 600. I stay between 1K and 2.5K and would be leary about going above that. But thats just me.

When you said the machine was bogging down, do you mean it stopped completely or was it jumping around? Bogging down means either the machine just can't handle the load, or you were applying to much pressure. Unless you have some real bad paint imperfections I like the rotary to almost glide along the surface.
 
I'm with Stephan was the pad jumping or hoping on the surface...this is created more by to much product in some cases....Also that 2.5 is a cutting agent...try and start with something like SSR1, its a bit thinner not clog up the pad so quick and start hoping on the surface...1800 RPM is high but its not so fast that with some practice you can work with it
 
Stephan said:
When you said the machine was bogging down, do you mean it stopped completely or was it jumping around? Bogging down means either the machine just can't handle the load, or you were applying to much pressure.
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Tanks for your reply .
It almost came to a compelete stop ,I reduced the pressure to get it going ,it was like I needed more lubrication to make the pad glide over the paint.
One thing I forgot to mention,the paint is single stage and it was clayed a few months ago.the suface is nice and clean.
 
distrbd said:
Tanks for your reply .
It almost came to a compelete stop ,I reduced the pressure to get it going ,it was like I needed more lubrication to make the pad glide over the paint.
One thing I forgot to mention,the paint is single stage and it was clayed a few months ago.the suface is nice and clean.
Click to expand...

Pull up on that machine...before you start, spray a mist of water or QD spray...then let the pad glide across the surface holding it up so that it spins freely...I think whats happening is you are baring down on it to hard....a rotary dose not need pressure, it works on speed and heat
 
sorry to say, I think the machine is just not going to do the work ... if it's coming to a stop or almost a stop then it's just going to waste your time...I also advise not trying 3600 rpms on anything you like;)
 
Beemerboy said:
Pull up on that machine...before you start, spray a mist of water or QD spray...then let the pad glide across the surface holding it up so that it spins freely...I think whats happening is you are baring down on it to hard....a rotary dose not need pressure, it works on speed and heat
Click to expand...

I'll try to spray a little QD ,reduce pressure then see if the pad glides.
Thanks BB.
 
Poorboy said:
sorry to say, I think the machine is just not going to do the work ... if it's coming to a stop or almost a stop then it's just going to waste your time...I also advise not trying 3600 rpms on anything you like;)
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That's what I'm thinking,if this POS machine slows down at the slightest bit of pressure then doesn't matter what polish or how much lubrication I use.
Metabo here I come.

I just tried to lube the pad with water and at first it seemed like it was working but as the water dried ,the machine started to bog.
 
Thank you all for your replies.a friend of mine is coming over with his Metabo to determine if it's my machine or if it's me.
You get what you pay for.
 
What brand of machine did you purchase so nobody else makes the same mistake?

Is there an adequate novice polisher that is less than the Porter Cable?

Thanks-Mike
 
mikespine said:
What brand of machine did you purchase so nobody else makes the same mistake?

Is there an adequate novice polisher that is less than the Porter Cable?

Thanks-Mike
Click to expand...

I have a De Walt orbital buffer and its a work horse...what you are really buying is a orbital sander, they come with velcro backing plate..that can fit the pads...

This is the unit that I have

DeWalt DW443 Heavy-Duty 6" Right Angle Random Orbit Sander with Electronic Variable Speed

I would also check coastaltools, for specials they are one of the cheapest on the net....if you do buy one make sure it comes as a kit with the backing plate

Here is the PC at Costal tools for just over a 100 bucks


Porter Cable 7424 Car Buffer, 7424 Polisher
 
Beemerboy said:
I have a De Walt orbital buffer and its a work horse...what you are really buying is a orbital sander, they come with velcro backing plate..that can fit the pads...

This is the unit that I have

DeWalt DW443 Heavy-Duty 6" Right Angle Random Orbit Sander with Electronic Variable Speed...
Click to expand...
I think this thread was talking about a "rotary" -- if so, you might wanna step up to one like mine...

http://www.tylertool.com/dewdwheavdut57.html

With respect to the hop or bounce you mentioned, this usually is the result of having the pad too flat. Unlike an orbital, a rotary needs to be tipped ever so slightly (1-2 degrees) so it will only be working on one half of the flat. Tipped to steep, and it's prone to leave swirls, not enough, and it'll hopp -- especially when using foam pads. Also, a rotary does not need to be mashed down like an orbital, let the machine and the polish do the work -- not your muscle.

hope this helps....


P.S. Beemer... I did a full service Custom hand wash on a white Denali XL -- total time less than 13 minutes... (albiet with four of us) ;)
 
dr_detail said:
I think this thread was talking about a "rotary" -- if so, you might wanna step up to one like mine...

DeWalt DW849 Heavy-Duty 7"/9" Electronic Variable Speed Polisher

With respect to the hop or bounce you mentioned, this usually is the result of having the pad too flat. Unlike an orbital, a rotary needs to be tipped ever so slightly (1-2 degrees) so it will only be working on one half of the flat. Tipped to steep, and it's prone to leave swirls, not enough, and it'll hopp -- especially when using foam pads. Also, a rotary does not need to be mashed down like an orbital, let the machine and the polish do the work -- not your muscle.

hope this helps....


P.S. Beemer... I did a full service Custom hand wash on a white Denali XL -- total time less than 13 minutes... (albiet with four of us) ;)
Click to expand...

well I guess it pays to read what everyone is talking about..well if someone need a orbital I've provided some links:D

I have a Hitachi rotary...got mine at a garage sales years ago...another work horse..

Good obversation about the hop on the pad..soild


Pssss..I did a 08...550i BMW wash time was 1.2 hours by myself with one PP break, and have the vid to prove it:D
 
I have the Porter and Cable Rotary the 7428, it has worked well for me I just wish it had a lower speed setting in the 700k area, and I wish it was slightly lighter.
 
Beemerboy said:
Pull up on that machine...before you start, spray a mist of water or QD spray...then let the pad glide across the surface holding it up so that it spins freely...I think whats happening is you are baring down on it to hard....a rotary dose not need pressure, it works on speed and heat
Click to expand...

I'm interested in this tip. Can you use the QD spray with most compounds and polishes? I use MALCO True Grit and Rejuvenator mostly (Sorry, don't know the abbreviations yet.) and notice that they get dry and tacky very quickly and I begin to get that hopping situation and really have to muscle my machine to keep it smooth and steady. (Not pressing down harder...just keeping the the machine from jumping around.) This would cause no problems with the product or the surface??
 
AlphaOmega said:
I'm interested in this tip. Can you use the QD spray with most compounds and polishes? I use MALCO True Grit and Rejuvenator mostly (Sorry, don't know the abbreviations yet.) and notice that they get dry and tacky very quickly and I begin to get that hopping situation and really have to muscle my machine to keep it smooth and steady. (Not pressing down harder...just keeping the the machine from jumping around.) This would cause no problems with the product or the surface??
Click to expand...

I just spray a small amount of OD or even water on the panel...that seems to thin out the product and keeps the buildup down...I clean the surface of the pad about every 3 to 4 times that I use it...just helps to keep the pad from hoping...I also work with the pad at a very slight angle...if the pad is flat on the surface it hops pretty fast IMO
 
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