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gianttomato Forums Junkie I supported Toymods Location: I renounced punctuation Registered: May 2002	Re: how a 7m block and head *should* look Thu, 25 September 2003 03:47 Allan, IIRC from my telescope making days, the glass thickness needs to be at least one sixth the diameter in order to prevent significant distortion (remember we are talking thousandths of an inch and less here). Glass is also not particularly thermally stable so Pyrex is preferred. So, by my reckoning, we are looking at a Pyrex blank that is around 700 x 400 x 120 mm in order to adequately lap this 7M head such that you can be confident that the lapping tool is not introducing imperfections in the surface (I'll ignore the whole technique thing which is probably more important). I can assure you that you can blow a head gasket a month for the next year for the price of that sucker. I'm not sure what trip Reg Reimer was on when he wrote that. [Report message to a moderator]

	Subject	Poster	Date
	how a 7m block and head *should* look	ed_ma61	Wed, 24 September 2003 12:29
	Re: how a 7m block and head *should* look (big files)	gianttomato	Wed, 24 September 2003 12:54
	Re: how a 7m block and head *should* look (big files)	Stenno	Wed, 24 September 2003 13:44
	Re: how a 7m block and head *should* look (big files)	Allan	Wed, 24 September 2003 13:53
	Re: how a 7m block and head *should* look (big files)	Stenno	Wed, 24 September 2003 14:03
	Re: how a 7m block and head *should* look (big files)	gianttomato	Wed, 24 September 2003 14:10
	Re: how a 7m block and head *should* look (big files)	Allan	Wed, 24 September 2003 14:38
	Re: how a 7m block and head *should* look	ed_ma61	Wed, 24 September 2003 14:42
	Re: how a 7m block and head *should* look	Allan	Wed, 24 September 2003 14:53
	Re: how a 7m block and head *should* look	gianttomato	Wed, 24 September 2003 14:55
	Re: how a 7m block and head *should* look	Allan	Thu, 25 September 2003 00:17
	Re: how a 7m block and head *should* look	Danners	Wed, 24 September 2003 23:31
	Re: how a 7m block and head *should* look	THE WITZL	Thu, 25 September 2003 02:13
	Re: how a 7m block and head *should* look	rob_RA40	Thu, 25 September 2003 02:25
	Re: how a 7m block and head *should* look	ed_ma61	Thu, 25 September 2003 02:28
	Re: how a 7m block and head *should* look	Allan	Thu, 25 September 2003 02:38
	Re: how a 7m block and head *should* look	gianttomato	Thu, 25 September 2003 03:47
	Re: how a 7m block and head *should* look	chrisss	Thu, 25 September 2003 09:19
	Re: how a 7m block and head *should* look	gianttomato	Thu, 25 September 2003 10:03
	Re: how a 7m block and head *should* look	ed_ma61	Thu, 25 September 2003 10:39
	Re: how a 7m block and head *should* look	ed_ma61	Thu, 25 September 2003 10:42
	Re: how a 7m block and head *should* look	gianttomato	Thu, 25 September 2003 13:36
	Re: how a 7m block and head *should* look	ed_ma61	Thu, 25 September 2003 13:46
	Re: how a 7m block and head *should* look	gianttomato	Thu, 25 September 2003 13:53
	Re: how a 7m block and head *should* look	Allan	Thu, 25 September 2003 14:04

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