robertspark Posted November 29, 2014 Share Posted November 29, 2014 As per the title.... need some internal splines (32) cut into a transfer box input gear, found a fella over near blackburn, thought I'd check on here if someone wanted the business first? got all of the spec's on the external spline (got to find the sheet of paper at first) and have the shaft too. Also would like the gear recase hardened as I'm lead to believe they are case hardened as standard, I've not got a furnace or oxy acetylene or I'd have a go myself Thanks for your time / interest Rob Quote Link to comment Share on other sites More sharing options...
stuck Posted November 29, 2014 Share Posted November 29, 2014 Can't help with the machining Rob but could case harden it for you. Mick. Quote Link to comment Share on other sites More sharing options...
robertspark Posted November 29, 2014 Author Share Posted November 29, 2014 Thanks very much Mick, have you got you're 4.6 sorted now? If you're looking for tools (timing light sort of stuff in the future, just let me know as I've got quite a bit [usual landrover support garage of non-dealership / garage trusting owner....]) Quote Link to comment Share on other sites More sharing options...
stuck Posted November 29, 2014 Share Posted November 29, 2014 No problem Rob. 4.6 is a job for tomorrow, been too busy today. Quote Link to comment Share on other sites More sharing options...
ejparrott Posted December 11, 2014 Share Posted December 11, 2014 Did you get it done? We have a wire, won't be able to do anything until after Christmas though Quote Link to comment Share on other sites More sharing options...
robertspark Posted December 11, 2014 Author Share Posted December 11, 2014 ejparrott, thanks for coming back to me on this one (I did wondering if you did it as I'd looked at your link but wasn't sure if it was more for production runs than one off's). Haven't got it done yet (not had a chance to get across to the engineering firm, I try to tie it in with a site visit normally out of the office). I'll say I'm in no hurry with my build, I'm just making steady progress, long build list and just ticking things off. The spline I'm hoping to have cut into a standard LT230 input gear (26T / 33mm gear width, FTC 5089) is as follows: Number of Teeth - 31 Diametral Module - 1.09247 Pressure Angle - 30º Pitch Diameter - 33.86667 Base Circle Diameter - 29.32932 Major Diameter - 34.72 - 34.34 Minor Diameter - 31.37 - 31.12 T.I.F. Diameter (maximum) - 31.953 minimum fillet radius - 0.29 circular tooth thickness max. effective - 1.422 circular tooth thickness min. actual - 1.321 measure over pins minimum actual - 37.424 pin diameter - 2.438 does the above help in machine setup? I've also got the male mainshaft and a matching splined yoke which can be used for fit testing. Thanks for your time / interest, Rob Quote Link to comment Share on other sites More sharing options...
ejparrott Posted December 11, 2014 Share Posted December 11, 2014 It doesn't get used very often. There's a job coming up for it in the new year that'll occupy it for a while, but it's not an every day machine, and we do use it for one offs as well as short runs. I'll have to have a think about the drawing, if you can supply a CAD file then we're well away Quote Link to comment Share on other sites More sharing options...
robertspark Posted December 11, 2014 Author Share Posted December 11, 2014 Ok, let me see what I can do on the CAD drawing side (CAD pays the bills for me .... just need to figure out all the above terminology, which cam from the mainshaft manufacturer). Give me a couple of days and I'll post something Much appreciated Rob Quote Link to comment Share on other sites More sharing options...
robertspark Posted December 15, 2014 Author Share Posted December 15, 2014 Well, this spline has got me baffled..... I got the info above on the mainshaft spline direct from Tremec (the gearbox manufacturer), and I've got a driveshaft yoke for a 31 spline ford (reportedly a mustang) The problem is I cannot quite get the female spline to align with the male spline (when calculating + drawing them), the reason behind this is although complex confusing. i've found a copy of the Machinery's handbook, and given that the gearbox is American, and the 31 spline yoke is american, one would think that it would align with the ANSI or more correctly the SAE (Society of Automotive Engineers) guidance. The basics are, given it's a 31 spline mainshaft, and from the "metric" spline information given above has a Diametral Module of 1.09247, which translates to a diametral pitch of 23.25... the Diametral Module is a bit of an odd ball one, for anyone in the know given cutters "normally" come in standard sizes, and given it's american, and aligns with some of the older 31 spline stuff, I thought that it would align with imperial, which it almost does, given the standard diametral pitch for automotive splines seems to be 24 http://www.markwilliams.com/schmaxles.aspx I've posted a question on the eng tips forum out of curiosity : http://www.eng-tips.com/viewthread.cfm?qid=376816 Long and short, drawn the external one from the numbers given, struggling to draw the internal one / calculate the numbers to draw the internal one from all the formulas given in the Machinery's Handbook. ahh well, another day another lesson.. Quote Link to comment Share on other sites More sharing options...
robertspark Posted December 18, 2014 Author Share Posted December 18, 2014 One 31 Tooth spline drawing in CAD file format for the resplining of an LT230 input gear attached. Wow, one learning curve! Hub Tooth Profile.dxf Quote Link to comment Share on other sites More sharing options...
ejparrott Posted December 18, 2014 Share Posted December 18, 2014 Got ya. Will look at after christmas. Suggest a test piece for a trial fit. Quote Link to comment Share on other sites More sharing options...
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