Miniature herringbone gears Image credit: Run Ryder | Perpendicular herringbone gears Image credit: Wikimedia | Crossed double helix gear Image credit: 1 DKM 2B. Herringbone gears, also called double helical gears, are gear sets designed to transmit power through parallel or, less commonly, perpendicular axes. The unique tooth structure of a herringbone gear consists of two adjoining, opposite helixes that appear in the shape of the letter 'V'.
Phone Contact Numbers. The Dell customer service phone number claims the caller must have an order number or express service code when calling. This is not the case. You can contact the general customer service number to ask general questions without this information. General Customer Service: 1-512â338-4400.
Use the following DIRECTV phone numbers to contact the Answer Center for customer support: General Customer Service. 1-855-679-4357. Existing customers may call this number for general support from 8 a.m. to 1 a.m., 7 days a week. Technical Support. 1-855-679-4357. Technical support is available for existing customers 24 hours a day, 7 days a week. Customer Service for the Hearing Impaired. 1-800-779-4388 (with a TTY compatible device) Hearing-impaired customers can call this number for support if they have a TTY compatible device.