# When drawing a straight line, it turns into a curved line. **1.Parts of the machine are too loose.** A)Check whether the pulleys of X-axis and Y-axis are loose, and can be fine-tuned by the eccentric nut near the pulley. Not to be too tight between the pulley and the track. B)Check the belt for looseness, tighten the belt. C)Check if the laser head shakes, you need to tighten the screws to keep it vertical. --- # Agent Instructions: Querying This Documentation If you need additional information that is not directly available in this page, you can query the documentation dynamically by asking a question. Perform an HTTP GET request on the current page URL with the `ask` query parameter: ``` GET https://gathery.gitbook.io/faq/when-drawing-a-straight-line-it-turns-into-a-curved-line..md?ask= ``` The question should be specific, self-contained, and written in natural language. The response will contain a direct answer to the question and relevant excerpts and sources from the documentation. Use this mechanism when the answer is not explicitly present in the current page, you need clarification or additional context, or you want to retrieve related documentation sections.