A Grinder, or A Polisher,, or BOTH!!??
Page 1 of 2 1 2 LastLast
Results 1 to 10 of 13
Like Tree36Likes

Thread: A Grinder, or A Polisher,, or BOTH!!??

  1. Top | #1

    Join Date
    Jul 2015
    Last Online
    Today @ 06:17 PM
    Location
    Near Roa. VA
    Posts
    3,576
    Thanks
    43
    Thanked 437 Times in 337 Posts

    A Grinder, or A Polisher,, or BOTH!!??

    So, I was watching YouTube (YEA, I know,,, dangerous!! )

    The guy was refinishing paint on a car, and using a 7 inch variable speed polisher

    He had the item # for the polisher listed,, DEWALT DWP849 7-Inch/9-Inch Variable Speed Polisher - Power Polishing Tools - Amazon.com

    Then, just for grins,, I looked up the 7 inch grinder,, both are about the same amps,, the grinder seems to turn a higher speed.

    So, is a polisher simply a grinder with variable speed?

    Would the grinder have more rugged bearings? DEWALT D28499X 7-Inch/9-Inch 5.3-Horsepower Large Angle Grinder - Power Angle Grinders - Amazon.com

    I have never owned either,, it would be nice if one tool could do both,,

    Maybe the top speed of the polisher (3,500 RPM's ) is too slow to grind?

    I tried comparing watts of each,, that does not make any sense,, I think the grinder watts are off by 2X,,,
    Oh well,, any help/guidance would be greatly appreciated!!
    Some of the tractors include JD 4105, JD 855, JD 650,,,, and,,, the IH 584 4WD
    My favorite attachment is the homemade landplane,,, EVERYONE needs one of those!!

  2. Remove Advertisements
    GreenTractorTalk.com
    Advertisements
     

  3. Top | #2
    IndianaJim's Avatar
    Join Date
    Feb 2013
    Last Online
    Today @ 06:08 PM
    Location
    Indiana
    Posts
    1,448
    Thanks
    24
    Thanked 198 Times in 151 Posts
    I do a bit of grinding now and then. Well, every now and then I do a LOT of grinding would be a better way to put it.
    I actually own the Snap-On version of that Dewalt polisher.
    Most in that speed range are labeled as polisher/sander.
    They are a bit slow for grinding work, but they will do it just fine, if a bit slower.
    Bearing/internal part wise, the only difference I found when searching for parts for mine was the gearset itself is different depending on if its a grinder or polisher/sander. Otherwise they were the same. I got it for a steal, but it needed a new gearset. Someone was using it as a heavy grinder, and apparently had dropped it or something, as the grinding disc also showed damage.
    That was better than 10 years ago though, so it could be different now, though I doubt it. It wouldnt be cost effective to have two different bearings for the same head with just different gears.

    All that said, I bought it to be a polisher. I have no use for a grinder of that size, and have never even seen much use for one that size either. I used to work for a conveyor manufacturer, and the shop guys used the smaller 4.5" and 5" grinders. The install guys did too. I guess I cant see much advantage to the larger grinding disc, but that doesnt mean there isnt a need in some cases, otherwise nobody would buy them.
    If you decide you need one, make sure you get one with the with the speed control that maintains speed regardless of load.
    They are much nicer to work with than the standard type.

    Im also not big on grinding discs anymore either. I went to heavy grit flap discs a few years back and even though my thumb doesnt like them much, I prefer them over grinding discs. For me, they work just as fast, and you can finesse them a bit more so you arent cutting in so fast while still doing work.

    Another general note on polishers.
    If you arent familiar with them, meaning if you havent worked with them extensively, Id recommend an orbital polisher.
    You can damage a finish REAL fast with a rotary polisher.
    I guess kinda like a tractor, it depends an awful lot on what you plan to use it for.

    But then again, Im a self proclaimed oddball, so take that into account too!
    Last edited by IndianaJim; 02-14-2019 at 10:17 PM.
    mjncad, MDrew, OxPath and 5 others like this.
    Jim B.

    318, 49 Thrower, 2 80 Carts, 17AT cart, 54 Blade, 12" Brinly Plow, 30 Hydraulic Tiller w/extension & Briney 3-Pt hitch, 50 deck w/JRCO Cart Bagger.
    2025R, 120R loader w/Kens Bolt On Hooks, 260B backhoe w/8" & 16" buckets, Titan 36" forks, Imatch hitch, Weight Bracket/Hitch.

    Exmark Lazer Z HP 52"
    Husqvarna 550XP, 562XP, 55 Rancher

  4. The Following User Says Thank You to IndianaJim For This Useful Post:

    Zebrafive (02-15-2019)

  5. Top | #3

    Join Date
    Mar 2018
    Last Online
    Today @ 03:45 PM
    Location
    North New Jersey
    Posts
    395
    Thanks
    181
    Thanked 160 Times in 73 Posts
    Im with @IndianaJim when it comes to having a grinder that size. We do a lot of fabrication work where I work and a typical 4 1/2" grinder is all anyone uses. Sure there are a couple of old 7" ones in the shop but they are just too unweildly to be using on a continual basis.
    Also, most of the 4 1/2" grinders these days take a variety of blades for concrete / material cutting that just wouldnt be practical for any sort of 'precision' work. Using a 7" grinder in most cases these days is like using a bazooza as a fly swatter.....sure it will work but in most personal uses its just way too much overkill.
    mjncad, OxPath, CADplans and 1 others like this.

  6. Remove Advertisements
    GreenTractorTalk.com
    Advertisements
     

  7. Top | #4

    Join Date
    Jul 2015
    Last Online
    Today @ 06:17 PM
    Location
    Near Roa. VA
    Posts
    3,576
    Thanks
    43
    Thanked 437 Times in 337 Posts
    Quote Originally Posted by Toughsox View Post
    Using a 7" grinder in most cases these days is like using a bazooza as a fly swatter.....sure it will work but in most personal uses its just way too much overkill.
    I guess my metal fab falls in that category,, 100% of my needs have been met by 4 1/2" grinders for 40 years,,

    I have even worn out several Milwaukee grinders, but, the Makita is still running,,, and it was the first one ever purchased,,

    I want a polisher,, so I guess the right thing to do is buy a polisher, and forget 7" grinding,,,
    mjncad, OxPath, JD4044M and 1 others like this.
    Some of the tractors include JD 4105, JD 855, JD 650,,,, and,,, the IH 584 4WD
    My favorite attachment is the homemade landplane,,, EVERYONE needs one of those!!

  8. Top | #5
    glc
    glc is online now
    glc's Avatar
    Join Date
    Sep 2010
    Last Online
    Today @ 07:09 PM
    Location
    Big Beaver,Pa
    Posts
    5,152
    Thanks
    513
    Thanked 394 Times in 353 Posts
    Sometimes because of what and how much needed grinding, I would break out the big 'ol B&D 7" and have at it. But 99.9% of the time our 4-1/2 and 6" Metabo's took care of business!
    mjncad, OxPath, CADplans and 2 others like this.
    Greg from western pa



    2009 2520
    FEL/61" HD bucket/replaceable cutting edge
    62D2 MMM
    IMatch Quick Hitch
    A "REAL" snow blade ---- JD 380A modded to fit
    Homemade 3PT Receiver
    Homemade Ballast Box
    Woods GB65 Box Blade

    2019 JOHN DEERE X390 with 48" ACCEL DEEP DECK

    MY 2520 SE SEAT MOD:

    https://www.greentractortalk.com/for...d-for-the-2520

    MY BALLAST BOX
    https://www.greentractortalk.com/for...llast-box.html

  9. Top | #6
    JD4044M's Avatar
    Join Date
    Feb 2018
    Last Online
    Today @ 10:20 AM
    Location
    Okanogan, Washington State
    Posts
    2,711
    Thanks
    1,590
    Thanked 579 Times in 387 Posts
    Their are times for the 7" but man the damage it can do to you using it! I really have to hang on to one tight. A 7" Cup Brush on some steel lips or rough edges can jerk the crap out of the handles! I have lost a couple times using one and prefer the 4-5" ones and flappers are nice for a lot of grinding. Sometimes you got to go get the big one but very few times for me anymore.
    mjncad, glc, CADplans and 1 others like this.

  10. Top | #7

    Join Date
    Feb 2019
    Last Online
    Today @ 03:09 PM
    Location
    N. FL
    Posts
    155
    Thanks
    4
    Thanked 25 Times in 21 Posts
    If you use one of these for polishing be ready to repair all the swirl marks. Running one of these large disc polishers is an art form. On an edge you can burn the paint to the metal before you can say "don't do it".
    John Deere 4310 tractor, New Holland 575E backhoe, John Deere F725 mower

  11. Top | #8
    IndianaJim's Avatar
    Join Date
    Feb 2013
    Last Online
    Today @ 06:08 PM
    Location
    Indiana
    Posts
    1,448
    Thanks
    24
    Thanked 198 Times in 151 Posts
    Quote Originally Posted by Old Machinist View Post
    If you use one of these for polishing be ready to repair all the swirl marks. Running one of these large disc polishers is an art form. On an edge you can burn the paint to the metal before you can say "don't do it".
    Yep. Thats why I mentioned the orbitals. Rotary polishers (which these big monsters are) are for professionals.
    Ive run them on black a few times (living dangerously), but I used to work in a body shop too, and used to use them a lot.
    These days though, I prefer the orbitals.
    Much like shooting, running a rotary buffer is a perishable skill!
    glc, CADplans, JD4044M and 1 others like this.
    Jim B.

    318, 49 Thrower, 2 80 Carts, 17AT cart, 54 Blade, 12" Brinly Plow, 30 Hydraulic Tiller w/extension & Briney 3-Pt hitch, 50 deck w/JRCO Cart Bagger.
    2025R, 120R loader w/Kens Bolt On Hooks, 260B backhoe w/8" & 16" buckets, Titan 36" forks, Imatch hitch, Weight Bracket/Hitch.

    Exmark Lazer Z HP 52"
    Husqvarna 550XP, 562XP, 55 Rancher

  12. Top | #9

    Join Date
    Jul 2015
    Last Online
    Today @ 06:17 PM
    Location
    Near Roa. VA
    Posts
    3,576
    Thanks
    43
    Thanked 437 Times in 337 Posts
    Quote Originally Posted by IndianaJim View Post
    Yep. Thats why I mentioned the orbitals.
    Much like shooting, running a rotary buffer is a perishable skill!
    I have a Porter Cable orbital,, it is nice,, but there are times I just would like to try doing a bigger area,,
    The orbital worked good on the hood of the JD 650,, but, even that took some time.

    I may have been using the wrong compound, and wheels, I will get some of that at Walmart, and some from Amazon,,

    My 180K mile Silverado has LOTS of scratches!!

    On a similar note,, I ordered a PDR kit ,,, the Silverado has a couple dents,,,
    JD4044M and Toughsox like this.
    Some of the tractors include JD 4105, JD 855, JD 650,,,, and,,, the IH 584 4WD
    My favorite attachment is the homemade landplane,,, EVERYONE needs one of those!!

  13. Top | #10

    Join Date
    Jul 2015
    Last Online
    Today @ 06:17 PM
    Location
    Near Roa. VA
    Posts
    3,576
    Thanks
    43
    Thanked 437 Times in 337 Posts
    OK, I have to hope this guy is starting out, and trying to get positive reviews,

    They are offering a 7 inch polisher for $9.99 delivered,,

    1600W 7 Electric 6 Variable Speed Car Polisher Buffer Waxer Sander 600-3100RPM | eBay

    I ordered one,, we will see what happens,,,

    If it comes, it will probably take a month to get here,,
    Some of the tractors include JD 4105, JD 855, JD 650,,,, and,,, the IH 584 4WD
    My favorite attachment is the homemade landplane,,, EVERYONE needs one of those!!

  14. Remove Advertisements
    GreenTractorTalk.com
    Advertisements
     

Page 1 of 2 1 2 LastLast

Similar Threads

  1. Serviced both tractors today!
    By xhere in forum Medium Frame Compact Utility Tractors (MCUT)
    Replies: 7
    Last Post: 03-20-2015, 08:15 PM
  2. Landscape rake, Box blade or both
    By DOGoodman in forum Implements & Attachments
    Replies: 3
    Last Post: 08-07-2013, 08:37 AM
  3. 54" Blower - does mid-PTO shaft disconnect on both ends?
    By jgayman in forum Implements & Attachments
    Replies: 23
    Last Post: 03-22-2013, 07:19 AM
  4. Just got approval to purchase from both Wife & JD.
    By DrFeelgood in forum Large Frame Compact Utility Tractors (LCUT)
    Replies: 63
    Last Post: 11-17-2012, 07:45 AM

Bookmarks

Posting Permissions

  • You may not post new threads
  • You may not post replies
  • You may not post attachments
  • You may not edit your posts
  •