The thread size listed in the table should match the thread size on your lathe spindle.You did do well, and not a problem popping the spur drive, albeit some rust and a tight fit, it is a taper after all and unless the machining doesn't match should release, normally with a sharp tap with a knockout bar, wonder how much force can be applied normally as a dead blow, depend on if it's a 4lb lump hammer or not. These thread sizes listed are the size which the adaptor converts to (e.g.

If mismatching standard threads are used it may cause damage to both lathe and chuck therefore you will have to know the thread of the spindle accurately.Ī reference to quickly distinguish between Unified (UNC or UNF) and British (BSF or BSW) standards:įLAT TOP = 60° angle (UNC, UNF, Metric threads) ROUND TOP = 55° angle: Whitworth, BSW, BSF Even if the thread size is the same there are different standards of threads, e.g. You only need to do these measurements if you can’t find the info anywhere else.Įnsure that the thread on the adapter and lathe spindle has the exact same pitch and standard. If you can’t find the information on your spindle thread size you will need to take some measurements on your lathe spindle.

You will need to purchase a blank chuck or a blank insert/adaptor and get it threaded to your requirements.ĥ. If you have reliable information for your spindle thread size but there is no match on the chart, you may haveĪn unusual lathe that NOVA doesn’t have an adaptor for. (Then look at our insert/adaptor chart below to find your size).Ĥ. If they don’t have the info you can call your manufacturer. If you don’t have a manual, contact your supplier to get a copy of your manual and find out your spindle size. (Look at our insert/adaptor chart below to find your size)ģ. Inboard thread (LH – left hand or RH right hand or both: If not listed, look in your manual or sales literature to find the thread size.

If listed make a note of the SKU:_ (example IDNS, IENS, etc)Ģ. Refer to the insert/adaptor chart (below) to see if your lathe is listed. Determining Your Lathe Spindle Thread to find the correct NOVA insert adapter Determining Your Lathe Spindle Thread to find the correct NOVA insert adapterġ.

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