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Repairing damaged cams

Andy Warner All Messages By This Member #188900 I have an SG503 with a cam switch that has clearly been damaged by a soldering iron at some point in it’s past. Picture here: Does anyone on the list have experience or advice repairing damage such as this? I am thinking I dismantle the switch, remove the cam, and then fill the damage with some kind of material, file/sand to make good, then re-assemble. -- Andy
n4buq All Messages By This Member #188901 It's hard to tell, but it appears only one lobe would need to be repaired. The other one looks like it did not have a lobe at that point and all the might be done there is just smooth it out just a bit just to make sure there's no plastic sticking up that would enable the switch when it shouldn't. Perhaps some epoxy built up and then filed down to the radius for the lobe? JB Weld makes a Plastic Repair formula that might work. I think the hard part might be to make a "form" such that the liquid will stay put where it cures. You might also find a replacement cam. I see several different part numbers on eBay and one might be a direct replacement. Good luck with it. Thanks, Barry - N4BUQ toggle quoted message Show quoted text ----- Original Message ----- From: "Andy Warner" <andyw@...> To: "tekscopes" <[email protected]> Sent: Tuesday, December 21, 2021 7:26:48 PM Subject: [TekScopes] Repairing damaged cams I have an SG503 with a cam switch that has clearly been damaged by a soldering iron at some point in it’s past. Picture here: Does anyone on the list have experience or advice repairing damage such as this? I am thinking I dismantle the switch, remove the cam, and then fill the damage with some kind of material, file/sand to make good, then re-assemble. -- Andy
Dave Casey All Messages By This Member #188902 CA glue and baking soda would be a good way to fill/build up. Dave Casey toggle quoted message Show quoted text On Tue, Dec 21, 2021 at 7:48 PM n4buq <n4buq@...> wrote: It's hard to tell, but it appears only one lobe would need to be repaired. The other one looks like it did not have a lobe at that point and all the might be done there is just smooth it out just a bit just to make sure there's no plastic sticking up that would enable the switch when it shouldn't. Perhaps some epoxy built up and then filed down to the radius for the lobe? JB Weld makes a Plastic Repair formula that might work. I think the hard part might be to make a "form" such that the liquid will stay put where it cures. You might also find a replacement cam. I see several different part numbers on eBay and one might be a direct replacement. Good luck with it. Thanks, Barry - N4BUQ ----- Original Message ----- From: "Andy Warner" <andyw@...> To: "tekscopes" <[email protected]> Sent: Tuesday, December 21, 2021 7:26:48 PM Subject: [TekScopes] Repairing damaged cams I have an SG503 with a cam switch that has clearly been damaged by a soldering iron at some point in it’s past. Picture here: Does anyone on the list have experience or advice repairing damage such as this? I am thinking I dismantle the switch, remove the cam, and then fill the damage with some kind of material, file/sand to make good, then re-assemble. -- Andy
Andy Warner All Messages By This Member #188903 Did not know about CA + NaHCO3 before now, looks promising. Will try it and report back. N0BUQ, you are correct, only 1 of the tracks needs rebuilding. On Tue, Dec 21, 2021 at 20:58 Dave Casey <polara413@...> wrote: CA glue and baking soda would be a good way to fill/build up. Dave Casey On Tue, Dec 21, 2021 at 7:48 PM n4buq <n4buq@...> wrote: It's hard to tell, but it appears only one lobe would need to be repaired. The other one looks like it did not have a lobe at that point and all the might be done there is just smooth it out just a bit just to make sure there's no plastic sticking up that would enable the switch when it shouldn't. Perhaps some epoxy built up and then filed down to the radius for the lobe? JB Weld makes a Plastic Repair formula that might work. I think the hard part might be to make a "form" such that the liquid will stay put where it cures. You might also find a replacement cam. I see several different part numbers on eBay and one might be a direct replacement. Good luck with it. Thanks, Barry - N4BUQ ----- Original Message ----- From: "Andy Warner" <andyw@...> To: "tekscopes" <[email protected]> Sent: Tuesday, December 21, 2021 7:26:48 PM Subject: [TekScopes] Repairing damaged cams I have an SG503 with a cam switch that has clearly been damaged by a soldering iron at some point in it’s past. Picture here: Does anyone on the list have experience or advice repairing damage such as this? I am thinking I dismantle the switch, remove the cam, and then fill the damage with some kind of material, file/sand to make good, then re-assemble. -- Andy -- Andy
Raymond Domp Frank Member Profile All Messages By This Member #188910 On Wed, Dec 22, 2021 at 03:58 AM, Dave Casey wrote: CA glue and baking soda would be a good way to fill/build up. The original cam material provides low friction against the switch levers. Maybe a small, partial (graft) transplant from another cam switch model is feasible: many Tek modules contain these switches. Raymond
zenith5106 Member Profile All Messages By This Member #188915 On Wed, Dec 22, 2021 at 02:26 AM, Andy Warner wrote: Does anyone on the list have experience or advice repairing damage such as this? I have several scrapped SG503's so if you would replace the drum instead you can have one for the price of shipping (from Sweden). Contact me off list if you are interested. /H?kan

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