my profile | my password | search | faq & rules | forum home

» Film-Tech Forum ARCHIVE   » Operations   » Film Handlers' Forum   » Lavezzi VKF sprockets for Prevost? (Page 1)

This topic comprises 2 pages: 1  2

Author Topic: Lavezzi VKF sprockets for Prevost? Matthew Taylor Expert Film Handler Posts: 186 From: Essex, UK Registered: Mar 2004 posted 12-28-2005 05:02 PM                     Do Lavezzi produce their vkf sprocket for Prevost machines? I looked on RSEM but they don't seem to stock them for anything other than the USA machines.  |  IP: Logged Louis Bornwasser Film God Posts: 4441 From: prospect ky usa Registered: Mar 2005 posted 12-28-2005 07:22 PM                        I don't think so, but if you have an old sample, they will make them for you. $$$$$$$$ Louis  |  IP: Logged Mark Gulbrandsen Resident Trollmaster Posts: 16657 From: Music City Registered: Jun 99 posted 12-28-2005 08:37 PM                     Actually we may have them. I assume that you have a P-93.... We stock a custom VKF sprocket for the DP-70 that might fit or may be able to be easily mofified. Let me know the shaft diameter in millimeters and I'll check. I think the DP-70 shafts have a 12mm dia. but I may be wrong there..... it could be 14mm. To be honest LaVezzi is not all that expensive for custom stuff.... especially considering the quality product that you get. As long as you need quantity its alot less expensive getting custom parts made up than getting quantity parts from either Italy, Gernamy, or from BL$S. These sprockets in 100 quan. cost us so little as to not even matter much. We also stock many other custom and new/used parts for the DP-70. Mark  |  IP: Logged Matthew Taylor Expert Film Handler Posts: 186 From: Essex, UK Registered: Mar 2004 posted 12-29-2005 03:14 AM                     Actually Mark, it's the 35mm intermittent sprocket for the P70. Getting it done custom made would be a problem for me because I was only thinking about getting one - not one hundred!  |  IP: Logged Mark Gulbrandsen Resident Trollmaster Posts: 16657 From: Music City Registered: Jun 99 posted 12-29-2005 08:15 AM                     Let me check and see since we also had DP-70 intermittent sprockets made up. These are fastened with the classic screw and nut through the center though, but the bore may be the same. Far as I know aren't the Prevost and Cinemecanica intermittent sprockets the same.....? Mark  |  IP: Logged Richard Fowler Film God Posts: 2392 From: Ft. Lauderdale, FL, USA Registered: Jun 2001 posted 12-29-2005 10:05 AM                     The bore on a P-70 sprocket is 10.005mm and in an emergency you can use the sprocket for a Phillips FP5. The bore on a Cinemeccanica is 8mm..........  |  IP: Logged Mark Gulbrandsen Resident Trollmaster Posts: 16657 From: Music City Registered: Jun 99 posted 12-29-2005 10:47 AM                     Yea, all the Phillips machines had the same dia. star shaft. Our DP-70 intermittent sprocket would fit it then but he'd have to drill a hole in the exact right place to secure the sprocket to the shaft with the screw and nut. No small feat with a hand drill on a hardened piece of metal! Easily done while disassembled.... Mark  |  IP: Logged Will Kutler Phenomenal Film Handler Posts: 1506 From: Tucson, AZ, USA Registered: Feb 2001 posted 12-29-2005 11:11 AM                     If the sprocket fits but the bore/shaft diameter is a problem, I may recommend two possible solutions? I am unsure what the Rockwell hardness of a finished LaVezzi sprocket is, but if the bore is undersized, it can always be i.d. ground or, if the bore is oversized, a pressed in bushing might work? These are just suggestions on how to modify an existing sprocket to make it work. K.  |  IP: Logged Matthew Taylor Expert Film Handler Posts: 186 From: Essex, UK Registered: Mar 2004 posted 12-29-2005 11:18 AM                     Mark, the Prevost sprockets slide on the shaft and then you tighten a nut on the end which presumably pushes out the shaft centre to create a friction fit for the sprocket.  |  IP: Logged Mark Gulbrandsen Resident Trollmaster Posts: 16657 From: Music City Registered: Jun 99 posted 12-29-2005 11:22 AM                     Thats very possible Will. We have done this before and use a giinding place that's local here. So far they have done very nice work for us. We also use them to do a clean up pass on sound drums and to widen the groove in the DP-70 sound drums. The VKF sprocket in the upper photo was bored out by yours truely on a lathe with carbide tooling and lots of coolant. We wanted one to place in service for 6 months before having the batch made up. Its well hardened metal I'd say a 55c to 60c or there abouts. Boring it out on the lathe was not easy but was certainly possible as you can see. quote: Matthew Taylor Mark, the Prevost sprockets slide on the shaft and then you tighten a nut on the end which presumably pushes out the shaft centre to create a friction fit for the sprocket. Then it might work out for you..... Is the end of the sprocket notched to couple with a mating part on the movement? If so then we're out of luck since we didn't have the notch done. Mark  |  IP: Logged Matthew Taylor Expert Film Handler Posts: 186 From: Essex, UK Registered: Mar 2004 posted 12-29-2005 11:54 AM                     No the sprocket is just plain with a 10mm bore.  |  IP: Logged Matthew Taylor Expert Film Handler Posts: 186 From: Essex, UK Registered: Mar 2004 posted 12-30-2005 06:02 AM                     Mark, do you reckon I could get hold of something that would work with this?  |  IP: Logged Mark Gulbrandsen Resident Trollmaster Posts: 16657 From: Music City Registered: Jun 99 posted 12-30-2005 08:21 AM                     I am going back to work today and eill check our DP-70 intermittent sprockets.... been home with a bad cold. Mark  |  IP: Logged Mark Gulbrandsen Resident Trollmaster Posts: 16657 From: Music City Registered: Jun 99 posted 12-30-2005 10:18 PM                     I checked our DP-70 intermittent sprockets and they have CS type teeth as on the original Phillips sprockets. We nixed doing the intermittent sprockets in VKF because of clearance differences with the 35mm gate bands. You might fond one of these sprockets to be of higher quality than the Italian sprockets which always seem to be a bit on the rough side. The DP-70 feed and holdbacks we had made are VKF though. I would also still need to know if your star shaft has a keyed coupling point to lock the sprocket in one position when you install it... then you tighten it down by expanding the shaft with the set screw...... Ours does not have that keyed area at the end of the sprocket. Mark  |  IP: Logged Steve Guttag We forgot the crackers Gromit!!! Posts: 12814 From: Annapolis, MD Registered: Dec 1999 posted 12-31-2005 01:56 AM                     I know in the good old days when a Norelco AA2 wasn't expected to run 70mm for some time...we used to sub a Brenkert 35mm intermittent sprocket for the intermittent sprocket on the Norelco. Steve  |  IP: Logged

All times are Central (GMT -6:00)

This topic comprises 2 pages: 1  2

Printer-friendly view of this topic

Hop To: Select a Forum: Category: Operations -------------------- Digital Cinema Forum Film Handlers' Forum Large Format Forum Ground Level Feature Info, Trailer Attachments & REAL Credit Offsets Category: Community -------------------- Film-Yak Film Handlers' Movie Reviews The Afterlife Bob Maar's Joke-A-Thon Category: Classified -------------------- Equipment and Supplies Wanted/For Sale Help Wanted/Seeking Employment Category: System -------------------- Software Beta Testing Forum

The Film-Tech Forums are designed for various members related to the cinema industry to express their opinions, viewpoints and testimonials on various products, services and events based upon speculation, personal knowledge and factual information through use, therefore all views represented here allow no liability upon the publishers of this web site and the owners of said views assume no liability for any ill will resulting from these postings. The posts made here are for educational as well as entertainment purposes and as such anyone viewing this portion of the website must accept these views as statements of the author of that opinion and agrees to release the authors from any and all liability.