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Trunion help
2 Attachment(s)
does anyone have any suggestions on how to get this shaft out?
My saw (Rockwell contractor saw) has been very hard to raise the blade, so breaking it down the reason lies here. It won't move. I've used some penetrating oil to try to loosen it up, no help so far take it to a machine shop and have it pressed out? suggestions? TIA |
Trunion help
ChairMan wrote:
does anyone have any suggestions on how to get this shaft out? My saw (Rockwell contractor saw) has been very hard to raise the blade, so breaking it down the reason lies here. It won't move. I've used some penetrating oil to try to loosen it up, no help so far take it to a machine shop and have it pressed out? suggestions? TIA How much force have you put to it? -- -Mike- smacked it with a hammer(16oz) at least a dozen times with a slightly smaller diameter steel rod, moved about a 1/16th of an inch |
Trunion help
ChairMan wrote:
does anyone have any suggestions on how to get this shaft out? My saw (Rockwell contractor saw) has been very hard to raise the blade, so breaking it down the reason lies here. It won't move. I've used some penetrating oil to try to loosen it up, no help so far take it to a machine shop and have it pressed out? suggestions? TIA Is that a retaining pin in the center, or just a hole where one was? -- Gerald Ross I hate it when that happens. |
Trunion help
Gerald Ross wrote:
ChairMan wrote: does anyone have any suggestions on how to get this shaft out? My saw (Rockwell contractor saw) has been very hard to raise the blade, so breaking it down the reason lies here. It won't move. I've used some penetrating oil to try to loosen it up, no help so far take it to a machine shop and have it pressed out? suggestions? TIA Is that a retaining pin in the center, or just a hole where one was? Disclaimer: I am not a machinist and have never taken a saw apart.. It that is a retaining pin it is probably a tapered pin with a smaller hole on the opposite side where you can knock it out with a drift punch. If all this is true and you don't have a flat ended punch you can use something like a nail after grinding off the sharp end to make it flat ended. -- Gerald Ross I hate it when that happens. |
Trunion help
ChairMan wrote:
ChairMan wrote: does anyone have any suggestions on how to get this shaft out? My saw (Rockwell contractor saw) has been very hard to raise the blade, so breaking it down the reason lies here. It won't move. I've used some penetrating oil to try to loosen it up, no help so far take it to a machine shop and have it pressed out? suggestions? TIA How much force have you put to it? -- -Mike- smacked it with a hammer(16oz) at least a dozen times with a slightly smaller diameter steel rod, moved about a 1/16th of an inch It looks like you might have already tried to get some penetrating oil in there - seems like the pics show some signs of that. I would try throwing some heat at it if you have that capability. That's a lot of cast iron to absorb heat, so a propane or a map torch might not be enough heat. Then again... I have surprised myself in the past at the results of using map gas when I was certain that I'd need to hit the object with my acetelene torch. It's worth the attempt. Try to heat the pin. Ultimately, you would want to get the pin red hot if you could. -- -Mike- |
Trunion help
I would use heat as suggested.
It will burn the paint off though.... I had recently repaired a large drive through gate. The pins in the hinges were the nemesis of the problem since they were frozen solid and the owner forced the gate open. That was the problem. I tried penetrating oil, W-D 40, etc. etc. I was ready to give when I decided to use a propane torch.....like a small plumbers torch. I heated the area, well, let it cool, oiled it, (yes some burning and smoke) and then worked it. Doing this several times........ The heat expanded the fitting allowing the debris to come out and the hinge worked perfectly. These were very tight fitting pins in a large diameter cylinder. "ChairMan" wrote in message m... does anyone have any suggestions on how to get this shaft out? My saw (Rockwell contractor saw) has been very hard to raise the blade, so breaking it down the reason lies here. It won't move. I've used some penetrating oil to try to loosen it up, no help so far take it to a machine shop and have it pressed out? suggestions? TIA |
Trunion help
"Gerald Ross" wrote in message ... Gerald Ross wrote: ChairMan wrote: does anyone have any suggestions on how to get this shaft out? My saw (Rockwell contractor saw) has been very hard to raise the blade, so breaking it down the reason lies here. It won't move. I've used some penetrating oil to try to loosen it up, no help so far take it to a machine shop and have it pressed out? suggestions? TIA Is that a retaining pin in the center, or just a hole where one was? Disclaimer: I am not a machinist and have never taken a saw apart.. It that is a retaining pin it is probably a tapered pin with a smaller hole on the opposite side where you can knock it out with a drift punch. If all this is true and you don't have a flat ended punch you can use something like a nail after grinding off the sharp end to make it flat ended. If it's similar to this saw http://d3cmirsdb60x3h.cloudfront.net...34-441.big.pdf it's a set screw... If the screw was removed I'd check to make sure there isn't a second set screw below it. I've got double set screws on my Delta DJ-20 where the "top" screw serves as a locking screw for the first... I suppose that at different times they may have used a pin and if so it's likely a roll pin which has a hollow center. If it's not that I'd go with heat, a press, electrolysis or muriatic acid in that order. I'd be loathe to put too much pressure on it with a big press for fear of breaking the castings... use good support and moderation. John |
Trunion help
On Thu, 23 Feb 2012 08:14:04 -0500, "Mike Marlow"
wrote: . Try to heat the pin. Ultimately, you would want to get the pin red hot if you could. Heat the pin? Won't that just make it tighter? (Sorry if I'm being ignorant). -Zz |
Trunion help/update
1 Attachment(s)
"ChairMan" wrote in message m... does anyone have any suggestions on how to get this shaft out? My saw (Rockwell contractor saw) has been very hard to raise the blade, so breaking it down the reason lies here. It won't move. I've used some penetrating oil to try to loosen it up, no help so far take it to a machine shop and have it pressed out? suggestions? TIA Thanks for all the replies and suggestions. I never got the shaft out, but I clamped it to one of my horses and started lubing it with penetrating oil and working it up and down with a crowbar. Finally got it loosened up and then flooded it with WD-40 while I worked it up and down until it ran clear from rust. Now if I pull it to the up position on the horse it will fall to the down position. It moves like butta Again, thanks for all the replies and suggestions sidenote....rereading this reply, sounds almost kinky.....shaft, lube, upand down.....ahh, but I digresseg |
Trunion help
Zz Yzx wrote:
On Thu, 23 Feb 2012 08:14:04 -0500, "Mike Marlow" wrote: . Try to heat the pin. Ultimately, you would want to get the pin red hot if you could. Heat the pin? Won't that just make it tighter? (Sorry if I'm being ignorant). Not ignorant at all. Heat actually expands metal, but with such a big heat sink as the casting is, heating the pin is likely to break the rust bonds inside and free it up, with less effort/heating time. Heating the casting would be the right thing to do in order to swell it, but most times just breaking the rust bond is all you need to do. -- -Mike- |
Trunion help
On Thu, 23 Feb 2012 22:35:29 -0500, "Mike Marlow"
wrote: Zz Yzx wrote: On Thu, 23 Feb 2012 08:14:04 -0500, "Mike Marlow" wrote: . Try to heat the pin. Ultimately, you would want to get the pin red hot if you could. Heat the pin? Won't that just make it tighter? (Sorry if I'm being ignorant). Not ignorant at all. Heat actually expands metal, but with such a big heat sink as the casting is, heating the pin is likely to break the rust bonds inside and free it up, with less effort/heating time. Heating the casting would be the right thing to do in order to swell it, but most times just breaking the rust bond is all you need to do. thx |
Trunion help
"ChairMan" wrote in message m... does anyone have any suggestions on how to get this shaft out? My saw (Rockwell contractor saw) has been very hard to raise the blade, so breaking it down the reason lies here. It won't move. I've used some penetrating oil to try to loosen it up, no help so far take it to a machine shop and have it pressed out? suggestions? TIA Glad you got it out. FYI if you have never heard of Rust Buster get some to keep handy. I have used it for years. Had a shaft a 20 ton press would not remove. Rusted. Applied Rust Buster and in a few minutes push it out with my hand. This stuff eats rust fast. Used this many times when I was in major appliance work. WW |
Trunion help - rust buster01.JPG (0/1)
On Sat, 25 Feb 2012 09:40:18 -0700, "WW"
wrote: "ChairMan" wrote in message om... does anyone have any suggestions on how to get this shaft out? My saw (Rockwell contractor saw) has been very hard to raise the blade, so breaking it down the reason lies here. It won't move. I've used some penetrating oil to try to loosen it up, no help so far take it to a machine shop and have it pressed out? suggestions? TIA Glad you got it out. FYI if you have never heard of Rust Buster get some to keep handy. I have used it for years. Had a shaft a 20 ton press would not remove. Rusted. Applied Rust Buster and in a few minutes push it out with my hand. This stuff eats rust fast. Used this many times when I was in major appliance work. WW Is this the Rust Buster you mentioned? Who makes it? |
Trunion help - rust buster01.JPG (1/1)
1 Attachment(s)
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Trunion help - rust buster01.JPG (1/1)
"Buddy" wrote in message .. That is it. WW. |
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