unterhausen: "stripping paint with a sand blasting is pretty miserable"
I assume you mean without a cabinet which I would never even consider. A friend gave me a large blasting cabinet, already have a compressor that meets requirements for blasting. Just looking for a recommendation from someone experienced with bike frames, if not I'll use alum/ox 80-100 grit, this ain't rocket science.
info regarding nozzle size:
Nozzle Specifications
[TABLE="class: chart tablepad, width: 510"]
[TR]
[TH="class: head htext, bgcolor: #072F7A, colspan: 9"]
Air Consumption/Nozzle Size
(cubic feet per minute at pressures shown)[/TH]
[/TR]
[TR]
[TH="class: subhead shtext nozzlebore, bgcolor: #B2B2B2"]
Nozzle
Bore Size
[/TH]
[TH="class: subhead shtext fifty, bgcolor: #B2B2B2"]
50#
[/TH]
[TH="class: subhead shtext sixty, bgcolor: #B2B2B2"]
60#
[/TH]
[TH="class: subhead shtext seventy, bgcolor: #B2B2B2"]
70#
[/TH]
[TH="class: subhead shtext eighty, bgcolor: #B2B2B2"]
80#
[/TH]
[TH="class: subhead shtext niney, bgcolor: #B2B2B2"]
90#
[/TH]
[TH="class: subhead shtext onehundred, bgcolor: #B2B2B2"]
100#
[/TH]
[TH="class: subhead shtext consumption, bgcolor: #B2B2B2"]
Abrasive
Consumption
*
(pounds per hour)[/TH]
[TH="class: subhead shtext area, bgcolor: #B2B2B2"]
Blast Area
*
(feet per minute)[/TH]
[/TR]
[TR]
[TD="class: subhead shtext, bgcolor: #B2B2B2, colspan: 2"]
(general blasting
pressures)[/TD]
[/TR]
[TR]
[TD="class: bwhite nozzlebore"]
[SUP]3[/SUP]/32"[/TD]
[TD="class: bwhite fifty"]
8[/TD]
[TD="class: bwhite sixty"]
9[/TD]
[TD="class: bwhite seventy"]
11[/TD]
[TD="class: bwhite eighty"]
12[/TD]
[TD="class: bwhite ninety"]
13[/TD]
[TD="class: bwhite onehundred"]
15[/TD]
[TD="class: bwhite consumption"]
70-100[/TD]
[TD="class: bwhite area"]
0.5[/TD]
[/TR]
[TR]
[TD="class: bgray nozzlebore, bgcolor: #D0D0D0"]
[SUP]1[/SUP]/8"[/TD]
[TD="class: bgray fifty, bgcolor: #D0D0D0"]
15[/TD]
[TD="class: bgray sixty, bgcolor: #D0D0D0"]
17[/TD]
[TD="class: bgray seventy, bgcolor: #D0D0D0"]
19[/TD]
[TD="class: bgray eighty, bgcolor: #D0D0D0"]
21[/TD]
[TD="class: bgray ninety, bgcolor: #D0D0D0"]
24[/TD]
[TD="class: bgray onehundred, bgcolor: #D0D0D0"]
26[/TD]
[TD="class: bgray consumption, bgcolor: #D0D0D0"]
125-175[/TD]
[TD="class: bgray area, bgcolor: #D0D0D0"]
1-1.5[/TD]
[/TR]
[TR]
[TD="class: bwhite nozzlebore"]
[SUP]5[/SUP]/32"[/TD]
[TD="class: bwhite fifty"]
26[/TD]
[TD="class: bwhite sixty"]
30[/TD]
[TD="class: bwhite seventy"]
34[/TD]
[TD="class: bwhite eighty"]
38[/TD]
[TD="class: bwhite ninety"]
43[/TD]
[TD="class: bwhite onehundred"]
47[/TD]
[TD="class: bwhite consumption"]
175-250[/TD]
[TD="class: bwhite area"]
2-2.5[/TD]
[/TR]
[TR]
[TD="class: bgray nozzlebore, bgcolor: #D0D0D0"]
[SUP]3[/SUP]/16"[/TD]
[TD="class: bgray fifty, bgcolor: #D0D0D0"]
33[/TD]
[TD="class: bgray sixty, bgcolor: #D0D0D0"]
38[/TD]
[TD="class: bgray seventy, bgcolor: #D0D0D0"]
43[/TD]
[TD="class: bgray eighty, bgcolor: #D0D0D0"]
48[/TD]
[TD="class: bgray ninety, bgcolor: #D0D0D0"]
53[/TD]
[TD="class: bgray onehundred, bgcolor: #D0D0D0"]
58[/TD]
[TD="class: bgray consumption, bgcolor: #D0D0D0"]
275-400[/TD]
[TD="class: bgray area, bgcolor: #D0D0D0"]
3-3.5[/TD]
[/TR]
[TR]
[TD="class: bwhite nozzlebore"]
[SUP]1[/SUP]/4"[/TD]
[TD="class: bwhite fifty"]
58[/TD]
[TD="class: bwhite sixty"]
67[/TD]
[TD="class: bwhite seventy"]
76[/TD]
[TD="class: bwhite eighty"]
85[/TD]
[TD="class: bwhite ninety"]
94[/TD]
[TD="class: bwhite onehundred"]
103[/TD]
[TD="class: bwhite consumption"]
500-700[/TD]
[TD="class: bwhite area"]
4-4.5[/TD]
[/TR]
[TR]
[TD="class: bgray nozzlebore, bgcolor: #D0D0D0"]
[SUP]5[/SUP]/16"[/TD]
[TD="class: bgray fifty, bgcolor: #D0D0D0"]
91[/TD]
[TD="class: bgray sixty, bgcolor: #D0D0D0"]
105[/TD]
[TD="class: bgray seventy, bgcolor: #D0D0D0"]
119[/TD]
[TD="class: bgray eighty, bgcolor: #D0D0D0"]
133[/TD]
[TD="class: bgray ninety, bgcolor: #D0D0D0"]
146[/TD]
[TD="class: bgray onehundred, bgcolor: #D0D0D0"]
161[/TD]
[TD="class: bgray consumption, bgcolor: #D0D0D0"]
800-1100[/TD]
[TD="class: bgray area, bgcolor: #D0D0D0"]
5-5.5[/TD]
[/TR]
[TR]
[TD="class: bwhite nozzlebore"]
[SUP]3[/SUP]/8"[/TD]
[TD="class: bwhite fifty"]
130[/TD]
[TD="class: bwhite sixty"]
151[/TD]
[TD="class: bwhite seventy"]
171[/TD]
[TD="class: bwhite eighty"]
191[/TD]
[TD="class: bwhite ninety"]
211[/TD]
[TD="class: bwhite onehundred"]
232[/TD]
[TD="class: bwhite consumption"]
1200-1600[/TD]
[TD="class: bwhite area"]
6-6.5[/TD]
[/TR]
[TR]
[TD="class: bgray nozzlebore, bgcolor: #D0D0D0"]
[SUP]7[/SUP]/16"[/TD]
[TD="class: bgray fifty, bgcolor: #D0D0D0"]
178[/TD]
[TD="class: bgray sixty, bgcolor: #D0D0D0"]
206[/TD]
[TD="class: bgray seventy, bgcolor: #D0D0D0"]
233[/TD]
[TD="class: bgray eighty, bgcolor: #D0D0D0"]
260[/TD]
[TD="class: bgray ninety, bgcolor: #D0D0D0"]
286[/TD]
[TD="class: bgray onehundred, bgcolor: #D0D0D0"]
315[/TD]
[TD="class: bgray consumption, bgcolor: #D0D0D0"]
1700-2200[/TD]
[TD="class: bgray area, bgcolor: #D0D0D0"]
7-7.5[/TD]
[/TR]
[TR]
[TD="class: bwhite nozzlebore"]
[SUP]1[/SUP]/2"[/TD]
[TD="class: bwhite fifty"]
232[/TD]
[TD="class: bwhite sixty"]
268[/TD]
[TD="class: bwhite seventy"]
304[/TD]
[TD="class: bwhite eighty"]
340[/TD]
[TD="class: bwhite ninety"]
376[/TD]
[TD="class: bwhite onehundred"]
412[/TD]
[TD="class: bwhite consumption"]
2300-2800[/TD]
[TD="class: bwhite area"]
8-8.5[/TD]
[/TR]
[/TABLE]
* Note: Blast area coverage per/minute and abrasive consumption are approximate guidelines. Abrasive material used and surface blasted may alter coverage and consumption.
and media info:
Media
Many types of finish may be obtained by the selection of abrasive and by the adjustment of air pressure in the blasting unit. The more commonly used abrasives are
For the most efficient performance, when the abrasive in the machine has broken down too much, the entire load should be replaced. Adding new material to the old load greatly reduces the performance of the abrasive and increases the amount of dust.
If you are getting a sporadic flow of abrasive, it is being caused by fine material not flowing down to the pick-up area or too much pressure. Banging on the side of the cabinet hopper can test this. If the flow is good after this, your material is too fine or may be moist.
Media Hints
- Glass beads can be used to texturize, descale, or remove light burrs and die-cast flash leaving a smooth bright satin finish. Used at 40 to 80 PSI.
- Abrasive grits can be used for more aggressive work leaving a dull satin finish and are useful for creating a good surface for bonding. Use up to 120 PSI.
- Walnut shell grit can be used for deflashing thermoset plastics without destroying the original polish. Use 30 to 80 PSI.
and technique/method info:
Abrasive blasting is supposed to be a scrubbing action, not a peening process. Therefore, the gun should always be aimed at a 60° to 45° angle to the surface being cleaned. When the gun is aimed at 90°, peening occurs and, due to the abrasive particles colliding with the abrasive bouncing off the surface, a very high rate of media wear occurs
All above info from:
http://www.kramerindustriesonline.co...ing-guides.htm
and their
ShopTalk Forum:
http://www.kramerindustriesonline.co.../blasting.html
Brian