Shop Floor Talk  

Go Back   Shop Floor Talk > Welding and Metalworking Forums > Fabrication

SFT Search:   
Reply
 
Thread Tools Display Modes
  #1  
Old 03-18-2013, 07:19 PM
WinDancer's Avatar
WinDancer WinDancer is offline
Member
 
Join Date: Nov 2011
Location: Tenino, WA USA
Posts: 53
Default Sandblaster problem

My sandblaster [cabinet model] has stopped working properly.

The only way it will do anything except blow air is if I cover the nozzle and give it a little air for a second. Then it will work for a few seconds but even then it pulses, spitting instead of a smooth flow. It stops blowing sand within a minute or so.

I took off the tip to clean it but it was not plugged.

I reversed the tip and that did not help.

I made more holes in the pickup tube and that didn't help.

I taped the end of the pickup tube off, and that didn't help.

I swapped the pickup tube end for end and that didn't help

Every time I pull the pickup tube from the sand the tube is full.

I took some sand out and that didn't help.

I added more sand and that didn't help.

I replaced the factory gun a couple years ago and it has worked just fine since then. I have been very pleased with it until today.

The only other thing I can think to try is empty the cabinet completely and refill with new media.

Any suggestions?
Thanks,
Dave
__________________
Dave Evans
http://www.windancerknives.com/
Reply With Quote
  #2  
Old 03-18-2013, 07:28 PM
Lu47Dan's Avatar
Lu47Dan Lu47Dan is offline
Connoisseur of Old Iron
 
Join Date: Mar 2006
Location: N/W Pa.
Posts: 6,026
Default

Dave, the actual sand pick up tube needs to have a tube over it to supply air to the sand pick up tube if there is not sufficient air flow to the tube the sand flow will pulse. The pulsing is caused by vacuum in the sand supply tube over coming the resistance of the sand in the hopper.
Dan.
__________________
Tools to Men are like Shoes to Women , you can never have too many !!
Used diesel engines are an adventure anyway you look at them !!
Miller XMT-304 Multiprocess
Miller 10-E Wire Feeder
Miller Spectrum 2050 Plasma Cutter
Hobart AC/DC stick welder
Hobart 175 Mig
Craftsman O/A set
Turbo torch and B-tank
Reply With Quote
  #3  
Old 03-18-2013, 07:35 PM
H80N's Avatar
H80N H80N is offline
That Man Behind The Curtain
 
Join Date: Dec 2009
Location: NE Pa
Posts: 5,180
Default

The inside of the gun may be eroded away...

they wear out after a lot of use and cannot draw adequate vacuum to pull enough sand...

also... might you be experiencing more than normal humidity in your air suppy... have you drained filters?? or replaced wet elements... dessicant or TP..??
__________________
.
.

Pay no attention to that man behind the curtain..


The more you Know, The Better you Know, How little you Know (old Estonian saying)

Last edited by H80N; 03-18-2013 at 07:55 PM.
Reply With Quote
  #4  
Old 03-18-2013, 07:37 PM
Windy_Acres's Avatar
Windy_Acres Windy_Acres is offline
Chairman of the Headboard
 
Join Date: Jun 2012
Location: Northwest Illinois,.. the land of Fat Greasy Pancakes
Posts: 6,388
Default

What about moisture, that has always been the problem with cabinets and pressure pots. Moist sand does not feed well.
__________________
Whiskey bottles, and brand new cars, Oak tree you're in my way....
Reply With Quote
  #5  
Old 03-18-2013, 07:59 PM
H80N's Avatar
H80N H80N is offline
That Man Behind The Curtain
 
Join Date: Dec 2009
Location: NE Pa
Posts: 5,180
Default

Quote:
Originally Posted by Windy_Acres View Post
What about moisture, that has always been the problem with cabinets and pressure pots. Moist sand does not feed well.
I agree... that is the most common prob.... especially with dustgun blast cabinets... it does not take much to foul mine up even with filters and motorguard tp drier..
__________________
.
.

Pay no attention to that man behind the curtain..


The more you Know, The Better you Know, How little you Know (old Estonian saying)
Reply With Quote
  #6  
Old 03-19-2013, 12:21 AM
gimpyrobb's Avatar
gimpyrobb gimpyrobb is offline
Elite Member
 
Join Date: Jul 2012
Location: Cincy Oh
Posts: 2,160
Default

When is the last time you screened the sand? When what you described happens, we empty the sand and pour it on a screen. That keeps the nig hunks of crap out and lets the small sand particles back in to work. The big particles jamb up the flow.
Reply With Quote
  #7  
Old 03-19-2013, 11:58 AM
willyfixit willyfixit is offline
Member
 
Join Date: Mar 2013
Location: PA
Posts: 53
Default

Check the transition hose from the sand pick up tube to the gun for a crack or hole.

Willy
Reply With Quote
  #8  
Old 03-19-2013, 12:13 PM
Walker's Avatar
Walker Walker is offline
Standard of Excellence
 
Join Date: Aug 2004
Location: Cave Creek AZ
Posts: 4,671
Default

Ha the same problems with mine. Put a new gun on, and it now works fine. You can put the suction hose off and pull the trigger. You should feel strong suction at the nipple through all ranges of trigger pull, if not you have a gun problem. If you have good suction then you have a pick up tube problem.
__________________
Walker
Chief slag chipper and floor sweeper, Ironwood Artistic
Reply With Quote
  #9  
Old 03-23-2013, 01:22 PM
duckman903 duckman903 is offline
Member
 
Join Date: Aug 2011
Location: Winchendon MA
Posts: 233
Default

We had the same problem as you and cured it. Took a tap from the gun feed line and installed a small needle valve, then ran a line to the suction end of the pick up tube, them started blasting and opened the valve slowly until I got continuous flow of sand the extra air flow stops the plugging.
Reply With Quote
  #10  
Old 03-23-2013, 03:51 PM
WinDancer's Avatar
WinDancer WinDancer is offline
Member
 
Join Date: Nov 2011
Location: Tenino, WA USA
Posts: 53
Default

I strained the sand and that helped a little. I then stuck an empty piece of pipe around the horizontal pickup tube. That cured 98% of the problem I was having.
I will leave a small bulb burning on top of the media for a few days and hope that will solve the last little bit.
In the meantime I am back up and running.
Thank you all for the ideas!
Dave
__________________
Dave Evans
http://www.windancerknives.com/
Reply With Quote
Reply

Thread Tools
Display Modes

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off

Forum Jump

Web Search:

All times are GMT -5. The time now is 11:16 PM.


Powered by vBulletin® Version 3.8.11
Copyright ©2000 - 2022, vBulletin Solutions Inc.