This is something I've posted about before that is absolutely driving me nuts!!! The saw is about 14 years old, I'm a one man shop so fairly low usage. On start up the blade can sometimes be seen jerking a bit. After doing all I could, called in a repair company. They too are perplexed! Replaced belts and bearings in motor and arbor, checked voltage, inspected everything for loose bolts or visible cracks, etc. Checked with different blades to rule that out and added a blade stiffener (4") but problem persists. If I make a zero clearance plate it will be chewed up within a week. I've attached pictures of what the blade looks like after about an hours use ripping/crosscutting hoping that it may indicate something to someone of you out there. Cleaned it and you'll notice a line that forms just below the teeth -- does that mean anything? I'm wondering if it's time to buy a new saw, I wouldn't mind replacing it with a smaller unit since I'm not doing that much with sheet goods -- any suggestions would be greatly appreciated.
Look at the way the trunnion is mounted to the cast iron saw table. On older Delta contractor saws this was a sloppy setup. Perhaps there is something there that is allowing movement.
Another thought is a bad motor winding or starting capacitor that is intermittently causing a serious jolt to the motor during start up. This would actually be my best guess as to the cause of the problem as it does sound like a motor jolt problem.
Thanks B.H., I've thought along those lines of the motor since sometimes there is almost a "bark" like sound when it starts up. I'll check those trunnions too. Probably not much can be done about the motor other than replacement! When I had the tech out he did check the incoming voltage to be sure there wasn't any jump there --- may have to live with it but since I'm in Las Vegas and am going to AWFS who knows…..
I'd be inclined to open up all the electrical boxes and look for a loose or breaking wire. Look in the magnetic starter control box, the on/off button switch box, the motor electrical connector box etc. Keep an eye out for anything that looks like it might have been arcing. Unplug the saw before opening any of these up to be safe.
Failing all else you could pull the motor and take it to an electrical repair shop to check out. These though are getting harder and harder to find as the owners age out and aren't being replaced by new people. Cheap import motors of course have a huge affect on this situation.
Good idea BH, I'll check the connections for that. Since it's on a dedicated 220 circuit I'll check the wall outlet as well. When the repair guy was here he did take the motor to the shop so I'm assuming he ran whatever tests needed on it then.
One more thing. You mention that after a week a new zero clearance insert is chewed up.
Assuming the bearings are ok I'd take a close look at the blade arbor mounting system. Even with a bad electrical connection the blade/arbor assembly should remain true.
I'm wondering if you don't have a couple problems with the saw. An electrical issue that that is causing the intermittent slamming at startup and slop in the mounting somewhere causing the arbor assembly to shift.
FORUM GUIDELINES: Please review the guidelines below before posting at WOODWEB's Interactive Message Boards(return to top)
WOODWEB is a professional industrial woodworking site. Hobbyist and homeowner woodworking questions are inappropriate.
Messages should be kept reasonably short and on topic, relating to the focus of the forum. Responses should relate to the original question.
A valid email return address must be included with each message.
Advertising is inappropriate. The only exceptions are the Classified Ads Exchange, Machinery Exchange, Lumber Exchange, and Job Opportunities and Services Exchange. When posting listings in these areas, review the posting instructions carefully.
Subject lines may be edited for length and clarity.
"Cross posting" is not permitted. Choose the best forum for your question, and post your question at one forum only.
Messages requesting private responses will be removed - Forums are designed to provide information and assistance for all of our visitors. Private response requests are appropriate at WOODWEB's Exchanges and Job Opportunities and Services.
Messages that accuse businesses or individuals of alleged negative actions or behavior are inappropriate since WOODWEB is unable to verify or substantiate the claims.
Posts with the intent of soliciting answers to surveys are not appropriate. Contact WOODWEB for more information on initiating a survey.
Excessive forum participation by an individual upsets the balance of a healthy forum atmosphere. Individuals who excessively post responses containing marginal content will be considered repeat forum abusers.
Responses that initiate or support inappropriate and off-topic discussion of general politics detract from the professional woodworking focus of WOODWEB, and will be removed.
Participants are encouraged to use their real name when posting. Intentionally using another persons name is prohibited, and posts of this nature will be removed at WOODWEB's discretion.
Carefully review your message before clicking on the "Send Message" button - you will not be able to revise the message once it has been sent.
You will be notified of responses to the message(s) you posted via email. Be sure to enter your email address correctly.
WOODWEB's forums are a highly regarded resource for professional woodworkers. Messages and responses that are crafted in a professional and civil manner strengthen this resource. Messages that do not reflect a professional tone reduce the value of our forums.
Messages are inappropriate when their content: is deemed libelous in nature or is based on rumor, fails to meet basic standards of decorum, contains blatant advertising or inappropriate emphasis on self promotion (return to top).
Libel: Posts which defame an individual or organization, or employ a tone which can be viewed as malicious in nature. Words, pictures, or cartoons which expose a person or organization to public hatred, shame, disgrace, or ridicule, or induce an ill opinion of a person or organization, are libelous.
Improper Decorum: Posts which are profane, inciting, disrespectful or uncivil in tone, or maliciously worded. This also includes the venting of unsubstantiated opinions. Such messages do little to illuminate a given topic, and often have the opposite effect. Constructive criticism is acceptable (return to top).
Advertising: The purpose of WOODWEB Forums is to provide answers, not an advertising venue. Companies participating in a Forum discussion should provide specific answers to posted questions. WOODWEB suggests that businesses include an appropriately crafted signature in order to identify their company. A well meaning post that seems to be on-topic but contains a product reference may do your business more harm than good in the Forum environment. Forum users may perceive your references to specific products as unsolicited advertising (spam) and consciously avoid your web site or services. A well-crafted signature is an appropriate way to advertise your services that will not offend potential customers. Signatures should be limited to 4-6 lines, and may contain information that identifies the type of business you're in, your URL and email address (return to top).
Repeated Forum Abuse:
Forum participants who repeatedly fail to follow WOODWEB's Forum Guidelines may encounter difficulty when attempting to post messages.
There are often situations when the original message asks for opinions: "What is the best widget for my type of shop?". To a certain extent, the person posting the message is responsible for including specific questions within the message. An open ended question (like the one above) invites responses that may read as sales pitches. WOODWEB suggests that companies responding to such a question provide detailed and substantive replies rather than responses that read as a one-sided product promotion. It has been WOODWEB's experience that substantive responses are held in higher regard by our readers (return to top).
The staff of WOODWEB assume no responsibility for the accuracy, content, or outcome of any posting transmitted at WOODWEB's Message Boards. Participants should undertake the use of machinery, materials and methods discussed at WOODWEB's Message Boards after considerate evaluation, and at their own risk. WOODWEB reserves the right to delete any messages it deems inappropriate. (return to top)
Forum Posting Form Guidelines
The name you enter in this field will be the name that appears with your post or response (return to form).
Personal or business website links must point to the author's website. Inappropriate links will be removed without notice, and at WOODWEB's sole discretion. WOODWEB reserves the right to delete any messages with links it deems inappropriate. (return to form)
Your e-mail address will not be publicly viewable. Forum participants will be able to contact you using a contact link (included with your post) that is substituted for your actual address. You must include a valid email address in this field. (return to form)
Subject may be edited for length and clarity. Subject lines should provide an indication of the content of your post. (return to form)
Thread Related Link and Image Guidelines
Thread Related Links posted at WOODWEB's Forums and Exchanges should point to locations that provide supporting information for the topic being discussed in the current message thread. The purpose of WOODWEB Forums is to provide answers, not to serve as an advertising venue. A Thread Related Link that directs visitors to an area with inappropriate content will be removed. WOODWEB reserves the right to delete any messages with links or images it deems inappropriate. (return to form)
Thread Related File Uploads
Thread Related Files posted at WOODWEB's Forums and Exchanges should provide supporting information for the topic being discussed in the current message thread. Video Files: acceptable video formats are: .MOV .AVI .WMV .MPEG .MPG .MP4 (Image Upload Tips) If you encounter any difficulty when uploading video files, E-mail WOODWEB for assistance. The purpose of WOODWEB Forums is to provide answers, not to serve as an advertising venue. A Thread Related File that contains inappropriate content will be removed, and uploaded files that are not directly related to the message thread will be removed. WOODWEB reserves the right to delete any messages with links, files, or images it deems inappropriate. (return to form)
The editors, writers, and staff at Woodweb.com try to promote safe practices.
What is safe for one woodworker under certain conditions may not be safe
for others in different circumstances. Readers should undertake the use
of materials and methods discussed at Woodweb.com after considerate evaluation,
and at their own risk.