Welcome, Guest

TOPIC: Hummel Sander Leaving Chatter Marks

Hummel Sander Leaving Chatter Marks 03 May 2020 12:04 #20840

  • Pony Deal
  • Pony Deal's Avatar
  • OFFLINE
  • Posts: 280
  • Thank you received: 56
UFOMAN,

I was just re-reading this thread. Have you ever had internal gears, bearings, parts, etc go out
on the inside of that ufo unit? Is it constructed in such a way that you are able to open it up
to service the parts inside? How is the maintenance on it?

Can you discuss that a little bit?

Thanks,

Pony Deal

Hummel Sander Leaving Chatter Marks 03 May 2020 13:03 #20841

  • UFOMAN
  • UFOMAN's Avatar
  • OFFLINE
  • Posts: 169
  • Thank you received: 31
Sure pony, just hooked up my vac to my ufo and am about to start doing edges right now. When I get home ill download some pics I'll take with my phone but I can give you a basic rundown. The main body is about 4-5" bell housing which holds a main outside gear, they call it the tree, and. 4 ellipticals run inside it which is where the increased rpm come from. When I bought my first ufo i broke 3 trees because they were cast not forged aluminum, a mistake they corrected and I haven't had a problem since and nobody uses their ufo like I do! All I change now is the bearings every couple of years in the ellipticals. I'm about to cut the edges of 4 rooms with a 20 yearold finish and I use 36 grit 16" discs I put together with 3M 90 spray contact adhesive. If a bearing goes its a trip to Grainger and I'm back in business in a couple of hours. I'll take it apart and post some pics later in the week so you can see type ininternal.Ive seen all the other options and to me there is no comparison to the versatility of the ufo. You can dig a hole or lightly sand, wrong way hallways are now a breeze as I do 95% standing up with my buffer and its perfectly flat. Border work and herringbone and flush thresholds all no problem. Like I said I'll post some video if the site is set up for it as well. Let me know if you have anymore questions, more than happy to answer any and all.

Hummel Sander Leaving Chatter Marks 03 May 2020 17:08 #20844

  • UFOMAN
  • UFOMAN's Avatar
  • OFFLINE
  • Posts: 169
  • Thank you received: 31
I'll upload some pics in a couple of hours but you can look at the US Sander website and see an exploded diagram. There really isn't any maintenance, a couple of drops of their special oil once a month. I haven't done anything but that for the last 3 years and sometimes I run mine for hours at a time. It has been incredibly reliable, every 2-3 years I'll have a bearing seize, that's it. Actually you do have to replace the stippled driver plate, its peel and stick. I go thru a couple a year mainly because the trick to making it aggressive is using the thinnest driver pad possible, you don't want a spongy 1"pad as you lose all ability to cut. Between the thin driver pad and gluing 2 discs together I don't think there is any better way to get the almost perfectly flat floors I get. I'll try to get some low angle pics of these floors, there's no grain tearout because even with the screen there's no spongy pad that's cutting out the soft grain on plain sawn planks. Any qtr and rift is almost perfectly flat. So between angle cuts and and no 2 cuts at the same angle and a 60 grit disc cut in the field and a 80 screen to finish the floor looks like its already matte finished before I seal and 3 coats looks like 4 because the grain is so closed down. Pics coming soon.

Hummel Sander Leaving Chatter Marks 04 May 2020 16:04 #20853

  • Pony Deal
  • Pony Deal's Avatar
  • OFFLINE
  • Posts: 280
  • Thank you received: 56
Thanks UFOMAN. Does this piece of equipment sand in an :orbital fashion"
or is it more circular?

Do you have a link to a video of it being used or perhaps one
where maintenance is being done?

Also. what locks it in place and keeps it from rotating?

Hummel Sander Leaving Chatter Marks 05 May 2020 17:09 #20864

  • UFOMAN
  • UFOMAN's Avatar
  • OFFLINE
  • Posts: 169
  • Thank you received: 31
Pony, I had taken some video but having trouble finding it on my computer. There is a short video on the US Sander site. The ufo locks in just like a normal driver plate. The ufo itself is a 75 lbs DA and combined with the weight of a buffer makes for a very aggressive cutting dual action sander and cuts on the right side just like a normal buffer. Trying to upload some pics from my phone but will get some tomorrow with my digital camera. I've seen most of the other options out there and for the $ I think the ufo is the way to go.

Hummel Sander Leaving Chatter Marks 10 May 2020 18:27 #20887

  • Pony Deal
  • Pony Deal's Avatar
  • OFFLINE
  • Posts: 280
  • Thank you received: 56
Because it's not happening until the machine has
warmed up, I'd suggest trying a couple of other
brands of sanding belts.

It sounds like they may be slipping after they are
both warm and beginning to get slightly dull.

It's an easy thing to check.

Hummel Sander Leaving Chatter Marks 10 May 2020 19:49 #20888

Thats a lot of slow work for the trio to do..i myseld, 40 gradually strighten up to 80 then 100 on hummel, then drop back to red 80 grit or blue zirconia 100 on Trio...much master and still flat..if in doubt put an extra weigjt on trio or a dumbell/ weight...no need to do that much Trio work imo.
Peace

Hummel Sander Leaving Chatter Marks 11 May 2020 07:51 #20889

  • UFOMAN
  • UFOMAN's Avatar
  • OFFLINE
  • Posts: 169
  • Thank you received: 31
With the 1/4" driver pad I use on my ufo is the ultimate hardplate, no soft grain tearout, I haven't gone beyond 60 grit on my Hummel in 15 yrs, I find the soft drum on the Hummel was making my floors a little grainy. After I finish my last Hummel cut on a 15-20 degree angle I 60 disc and then 80 screen and typically there isn't a mark on the floor and the grain is so closed down my 3 coat jobs look like 4. Applying oil ply with a 18" center roller I just used 13 its of 550 duraseal on 900 ft. Besides being very flat the advantage of my ufo is I deliver a 4 coat job in 3 and have no soft grain tearout from over buffing with a screen. Just curious, how long does the trio take to do a cut? Is it like a Hummel belt pass or slower, 2-3 2 1/4 floor board pass?
Powered by Kunena Forum